Doug,
There are lots of choices in skis. All skis are a compromise as none will be 'just right' for all conditions you will encounter.
The skinniest, least powerful ski/boot combo I would use if I were doing the trip would be the Madshus Eon with a boot like the Fisher BCX6. I believe you can rent the Eons at Alpenglow Sports in Tahoe City. Problem is they only rent whimpy NNN BC boots. Though they might rent a plastic telemark boot with them. Brendan is the owner… nice guy.
http://alpenglowsports.com/
Tahoe Mountain Sports in King's Beach (north tahoe) might also rent some telemark or backcountry gear… these are nice guys too:
http://www.tahoemountainsports.com/prod_detail_list/snowsports?gclid=CMePr83srrsCFShk7AodjDMAjA
And The Backcountry in Truckee rents both tele or BC gear:
http://www.thebackcountry.net/
Courses: Alpine Skills Institute in Truckee (I believe they are upstairs inside The Backcountry store):
http://www.alpineskills.com/
I see they have a Introduction to Backcountry Skiing Course on Dec 21 and 28 (may at other dates after the holidays too?)
Bela G. Vadasz is the owner. I took a couple of private lessons from he and his wife many years ago that really improved my skiing at the time. They also offer avalanche classes, though I am still partial to Randall Osterhuber's class at http://donnersummitavalancheseminars.com/ (Randall is a good friend of mine… he is a snow scientist who has been running the Donner Summit Snow Lab for the State of CA for about the past 30 years… and tremendous backcountry skier)
I would not rule out a plastic telemark boot for your proposed trip. I think the range of gear you want to be in is from the light end being Madshus Eon w. Fisher BCX6 boot or similar to the more stable Madshus Epoch or Annum with say the Garmont Excursion plastic tele boot or similar. You could also use a plastic tele boot with the Madshus Eon.
I would not recommend doing that trip without learning the turns in my previous post. Even though that trip to 1000 Island Lake is not super hard, there will be some significant ups and downs.
Being able to turn in most or all conditions is super important. Turning is control. Without it you will fall your way down every significant slope. If it's icy… you could fall 500 or even 1,000 feet :(
When I was 17 and got my first car I was really jazzed to hop it up to make it go fast. My step-dad said to me, "Son, (he was trying to convince me to put my paycheck into brakes) there is one thing more important than going fast."
I was stunned. At 17 I couldn't imagine what was more important than looking cool and going fast. So I said, "What's That?" With a smirk and an attitude. He said, "Stopping. What are you going to do if you're going fast and can't stop?." Oh… so I decided to buy brakes.
Well, skiing is a bit the same. Except that stopping is not about your foot on a brake. In skiing your ability to make turns = your ability to stop. If you can't make turns, then the only way you're going to stop on a significant slop is to fall. And once you fall, lots of bad things can happen. (also turning under control allows you to avoid objects :)
So I recommend that you rent some tele or BC skis and take a class. At first take group classes, then go out and practice after the class, the same day and the next day. After you get up to, say, lower intermediate, then I recommend taking a private lesson or two. A private lesson with Bela (or other) at a, are you ready for this? At a downhill resort. Why? Well, when the lift is what's getting you up the slope you can make a TON more turns in a day. And that means a TON more practice. Which means a TON more progress. Unfortunately, it also means a TON more falls… It takes a lot of falling to learn to turn… or, at least it did for me.
Once you master turning on the groomed slopes. The take the lift to the top and ski down parallel to the groomed, but off the groomed. Do it over and over and do it under lots of different conditions: icy, powder, corn snow, breakable crust… That is the ultimate goal, to be able to ski most, if not all conditions…
Anyway, this is a big topic and there is more than one way to skin a cat. But the above is my advice to you Doug. Accomplish the above and you open up the entire Sierra to your winter adventures.
Billy