Tabatha, the Moritz is the best value for money accom in Aspen. I've stayed there 5 times (the other time was in the Bomber house, which was a blast) and it's never failed. Walking distance to just about everything you want, including the mountain shuttles.
As for car pooling, I've found that if you can get a second person, it's actually close enough in cost to getting the CME shuttle that the convenience factor tips the balance. And there's free parking outside St Moritz too.
Unfortunately though I won't be availing myself of any of the above this year. But hopefully 2015!