Replying to Breck/key/copper/abay

I'm heading out to colorado with my family in mid march, trying to decide what mountains to hit. spending sunday and monday in the breck/key area, then the rest of the week out by aspen. i'll be looking for steeps and good sidecountry, while my brother is more into long groomers and stuff. snowmass seems to be the right choice while we're in aspen, but i'm unsure where to go while we're near breck/key/copper/abay, especially considering sunday crowds
any suggestions for good snow conditions and good terrain? i'm not that worried about park conditions