Thank you everyone for your all of your help and replies. Planning for the PCT is obviously a lengthy recursive process. I won't bore you all with my constant waffling on the ULA Ohm vs. ULA Circuit vs. GG Mariposa Plus issue.
Ben — You make some good points about food resupply. I guess I have been looking at things from the perspective of what is possible, rather than what is desirable. That is likely a mistake. There is definitely merit to staying out on the trail for long stretches of time. I suppose I should be prepared for either possibility (10 day stretches or shorter ones) since it's probably one of those "see how I feel" kind of things. That's also a good tip about the Bearikade Expedition, although the price (even with rental at $6/day) is kind of tough to swallow. As far as the water purification method, I've only ever used Aquamira for purifying water–and I love the stuff, it's liquefied peace of mind. It is a fair point about the cost though, I will have to try to calculate that difference out.
Mike — Thanks again for all of your tips. I haven't yet ordered the Hexamid Twin, that's going to require a pretty big investment. I am looking into cheap tarp options to gain some experience with before making a decision on shelter options. Bug protection would be nice (I have to make some compromises due to hiking with my girlfriend), but I'm not at all opposed to sleeping with just a bug net on over my face. Especially if I'm going southbound (likely scenario), bugs should not be as much of an annoyance.
Dirk — Thanks for the tip on the snowpack in Washington. As far as Mexican food–ah well. I guess the demographic is different in trail towns than other places I've visited/lived in California. Authentic Mexican food is something of an anomaly in Michigan but I will survive.
Eugene — As far as the baselayers go, that is something that will probably require some testing. They are mostly for the purposes of staying warm when I sleep. I eschewed carrying a 20 degree bag with the understanding that I might need slightly warmer clothes for sleeping, since I tend to sleep cold. It also adds to versatility, since I can use them for hiking (at least the top baselayer) in slightly colder conditions. To be honest, based on the temperature data I've looked at, I could do without them–particularly the pants baselayer. It's not so much the smelling issue–I personally take it as a point of pride when I see the disgusted look on peoples' faces when you come back into town (favorite quote: "mommy what's that smell?" — little girl at the snack shop on top of Mt. Washington). I do have an interest in keeping my sleeping bag relatively free of body oils and sweat/moisture in addition to an extra amount of warmth while sleeping (which I need). I considered carrying lighter and cheaper silk baselayers for this purpose, but I could really use those for hiking and thus they aren't as versatile. You do make a good point about not wanting to get out of hiking clothes and into baselayers at night. That was a problem when I owned these insanely constrictive Marmot tights that were impossible to get on.
Dug — I actually haven't purchased the Tarptent Rainbow yet, I think I must have posted that by mistake. I was strongly considering it though (in addition to the Tarptent Squall). I do however have a SMD Wild Oasis which I own for solo use.
Bryan — I would bring a small iPhone wall charger for use in towns. I'm not exactly sure how good the battery life will hold up, so I will use it sparingly. I only plan to use it as a GPS if I get in a bind or for making sure I'm still on the trail periodically in snowy Northern Washington. I don't need, or always like, music when I'm hiking but it's kind of a nice luxury sometimes.
Thanks for the replies everyone, all of the fresh viewpoints help me keep the gears constantly turning.