In my humble opinion...
Hit Snowbird, Brighton, then Snowbasin and The Canyons. It's roughly a 30-1:30 drive to all those resorts from downtown SLC. Downtown SLC is pretty lame compared to real cities but it can be fun. You can stay slope-side at any of those resorts, just not much going there. Hopefully some guys from Utah will chime in, I just visit there sometimes.
Can't say much about Cali, I went to heavenly once and I thought it sucked. pretty views though.
No Colorado love?