Many good suggestions made in response to OPs question. I guess I'd just price it out. SLC vs. Denver are probably going to be your two most affordable airport gateways. Personally, unless you find a really great deal on 4wd, I'd go with a cheap economy rental car and if you happen to catch a big storm (unlikely), then buy some $50 chains. If you choose Denver/Colorado getting a four pack of lift tickets at Loveland ski area for each of you is an affordable possibility at $169. Loveland has a lot of fine intermediate terrain and can be uncrowded on regular weekdays. You could stay in a motel in Georgetown, CO or Comfort Suites Golden West on Evergreen Parkway and possibly add a day at Copper Mtn or Arapahoe Basin using Liftopia.