I'd do some homework on this before you make the final decision. In Summit and Eagle Counties (Breck / Copper / Keystone / Vail / Beaver Creek etc) the busiest weeks of the season are all the full weeks in March. The areas are a madhouse. Maybe some of the Pugski locals will chime in what what Aspen Crowds are like in March.
Thanks for the heads up on this one. I get back from work on March 5th and have the next couple of months off, so need to find a location to ski in Mid-March. I had really liked what I saw (I love FATMAPS) at Snowmass. I also really like the looks of Sun Peaks in BC too, but it is a biatch to get to from Florida. I have heard mixed things about Sun Valley for my ability level, but that is an attractive location too even though their ski in/ski out is limited. Ski in/Ski out is not a deal breaker, but Mrs. 53 much prefers it.