First off I should say thank you all for the excellent reviews and discussions here! I've been lurking since September and have learned a lot. It's been an epiphany to discover all these wonderful cottage industry gear makers. I've got about 6 or 7 bookmarked now but I know there are more to discover. (Is there a single curated list somewhere? That would be super useful!) So far I've picked up an EH Kalais pack (super!) and ZPacks windshirt and sleeping bag (both seem like technological wonders to me!). I know it's a new and untested design but I went ahead with an order for a full rain suit from Joe at ZPacks. It's been a joy working out little modifications to get things exactly the way I want.
On to the topic. Yes, I know there is no perfect anything. Here's the context:
Background/Experience (feel free to skip to Criteria below): I had a bit of backpacking experience in the late 80s/90s when I lived in California: maybe two dozen or so 5-day trips into the Sierra and other places. Sadly, not so much for the last 15 years due to present location. So now I have a wild bug up my ass that I need to do the JMT next summer. Well, it's a midlife thing. Actually, it was my wife's idea. I'm not a goal-oriented person normally: I always hated the idea of carrying my 50 lb pack very far (the only point of the damn thing was to get me 10-15 miles from a road for a few days). But circumstances require a goal-oriented approach now, so JMT is it.
At some point around 1992 I loaned out my tent and never got it back, or maybe I just forgot it when moving from one rental student house to another. After that I started taking a car tarp for trips into the Sierra, using parachute line and natural features/found poles for structure. I guess I've never camped on an exposed ridge in a storm, but I've gotten through a few short rain and hailstorms well enough. Either by accident or good planning, these trips were in late August or September so I never had mosquito problems. I did once test the "warm when wet" claim for my synthetic sleeping bag. This was Christmas week in Big Sur. I only had a smallish groundsheet on that hike and tried to roll up in it like a burrito. (I still think this concept has potential.) Fortunately this was an overnighter at Sykes. So when I got tired of the experiment, I just got up and spent the rest of the night in a hot tub.
Well, I finally got myself and wife back in Sierra in July 2011. It was great but I didn't much like carrying a BearVault (that's new) and my old giant pack (which was flaky, literally), and my wife's ex-husband's 10-pound tent. Actually the tent was a life saver since we had a very nasty mosquito experience that year. That's when she suggested that I go do the JMT … alone. (No, she had a good time! Says she wants to do JMT too. Next time. After I work out the kinks.)
Shelter Criteria:
1) I don't mind paying $500 if it's something I can use with my wife on other trips. If I'm buying a one-person shelter system, I'd rather not pay more than $250.
2) I really prefer cowboy camping and will do that whenever conditions permit (which they hopefully will 15 nights out of 20). Hence, a) sown in floor is non-optimal since I need a separate groundsheet anyway (or would it be stupid to sleep on top of an un-pitched tent with an air mattress?), and b) it's primary quality (sitting in the pack unused, I hope) is to weigh as little as possible.
3) Mosquito protection. I can take a few bugs, but I've become spoiled by Sierra camping in late August/September. Work forces me to start in late July when mosquitoes may or may not be a problem (seems likely that they will be intermittently so, depending on snowfall this year).
4) Weather protection. Since all my experience is "base camping" I never tried pitching my car tarp in any place that was very exposed. I guess it would be nice to be able to do so with a new shelter system, but not necessary (or at least I think not: I haven't plotted out my trek yet so I'm not sure if my slow 10-12 mile per day pace is compatible with finding less exposed campsites).
5) I have adjustable trekking poles.
6) I'm 5'8" and was once a submariner, so small spaces are acceptable.
Speaking of shelter systems: I still don't get the bivy. When I first saw one I thought that someone had been inspired by my "groundsheet burrito" method/attempt/experiment. But, alas! You still need a dang tarp! What's the point of that? Does a bivy + tarp weigh less than a single walled tent? Or a floorless tent + groundsheet? Or just a bigger tarp without bivy? Sorry, I don't want to start a war here. Just trying to understand the system and whether it might be worth looking into.
So what I've come to so far are two possibilities that meet my criteria. Neither are perfect but probably OK:
1) MLD Wild Oasis with tyvek groundsheet. Meets my solo price criteria at $175 with stakes and groundsheet (antigravitygear.com sells it that way). I think 20 oz for the whole setup but that's based on some guesswork (5 oz for small shaped Tyvek groundsheet?). The main drawback I see is that one has to be fully sealed up to protect from mosquitoes. I can take that for a few nights but would be very bummed if I had to seal up more than 10 nights. (Or I could add a bug screen door myself I guess. But I'd have to learn to sew and this would add some weight.)
2) ZPacks Hexamid Twin. Close to my higher price point for something I can use more generally with my wife. Joe says it's 19.7 oz including cuben groundsheet and stakes. The bug-screen-under-groundsheet system seems a bit weird to me: I kinda wish it was just a skirt like the Wild Oasis (though still having an open bug screen side somehow). All considered though it seems like a lovely tent. My main hesitation is putting out $510 and then seeing something I like better coming out next spring.
Another system I've seen is to have a "bug net tent" and tarp (or is that just a 2-walled tent?). These are a bit heavier by my calculations and don't allow me the full cowboy experience that I like (unless, as mentioned above, someone tells me that I can sleep on top of the whole thing in an air mattress without necessarily destroying it). However, if 2015 turns out to be a monster snow year, then I may revisit this as the best possible solution for many days with mosquitoes.
I should also mention that, although I prefer cowboy camping (I only just learned that term this year!), I've never done it in a down bag. I've never been surprised by rain/hail in the Sierra at night that wasn't imminently obvious at nightfall. But then, I probably have fewer than 100 nights in the Sierra to judge by. Still, I figure in worst case I will wake up and roll groundsheet over bag while quickly setting up tent. (Perhaps I should practice that drill at home before trip.)
Well, sorry for long (and possibly redundant) post. Please let me know if there are other approaches/products/companies that I should consider (I only discovered YAMA Mountain Gear this morning!). I may wait a while to see what new stuff comes out.

