there is a big difference between skiing in tahoe and in co or utah.
the snow in utah is so much lighter and fluffier (is that even a word?) than in tahoe.  you will find "sierra cement", as we call it, in tahoe.  that is not a bad thing, it is just heavier snow (I heard it is because the sierra's take the moisture out of the snow and what falls in utah is just like powdered sugar).  but not as heavy as say, washington state.  I have never skied in the the eastern US so I can't compare.  anywho, if you come to tahoe, squaw is a must.  but it is not a beginners mountain.  Northstar is fun, but a little flat.  but they have a new 'village' going up so it will be super nice, assuming they finish before the season.  I have a pass to northstar, because I have a place there and my wife is a beginner/intermediate skier so it is perfect for her.  if you stay on the north shore, you can ski, northstar, squaw, alpine, pretty easiler.  heavanly would a trek from the north shore as it is located in the south shore (about 40 minutes during the summar with no traffic).  kirkwood has the best snow in tahoe, but it is about 1 hour south of south shore...and not much to do around there.
Whistler is unbelievable, but I haven't been there in a few years and I hear it is getting very commerical and expensive.  Utah would probably be my first choice, because you get to ski a lot of different mountains with ideal conditions.