Only reason to go to Winter Park is for getting in some tree runs, or if you happen to have a propensity for moguls.
Especially since you're going to be here on a weekend, your best bets for non-packed resorts are Vail, Copper, Beaver Creek & Loveland. Unless you want to hit up places a bit farther away, then you could check out Monarch or Steamboat. Both are a 2 - 2.5 hour drive without traffic.
Cheap lift tix - all the grocery stores in Denver sell discounted tix. Also - if you can find someone that has a season pass, they can get you discounted tix too.
Are you staying in Denver?