I'll just add that Wildernest Sports and Pepi Stiegler Sports are also in the Village and are very convenient. They have good selections of demos as well.
Since I'm the rep for Head skis, I'll do my job and point out that Teton Village Sports is a great shop and has several Head models to demo.
(They also have Volkl, Rossi, and Salomon.)
If we haven't had much snow when you arrive and if you're skiing mostly groomers and bumps and old crud, you MUST try out the Head SuperShape Magnum. It's an excellent ski for a wide range of conditions.
Have fun when you get here. Up to a foot of new snow is forecast for tonight and tomorrow.