We just got back last night from Keystone. We were there last year about the same time (MLK holiday) and the conditions were better then, but I can?t complain. Even bad Colorado conditions beat the hell out of the best conditions we get in the DC area! We didn?t have any significant fresh snow, but the slopes were in pretty good condition, although some were beginning to get a bit icy in patches. But by February, you probably won?t have any problem.
On housing, I?m sure that Tony?s right that you could get it cheaper in town (although we got a 2-bedroom close to the Mountain House for $175/ nt, including tax and cleaning; I doubt you could beat that by very much), but with kids especially, there?s a real convenience factor in being able to come back to the condo for lunch or whenever someone gets tired. But, of course, it all depends on your needs.
From the Mountain House area, my recommendation is to take the Peru lift (Argentine is about the same location, but a lot slower and from the Peru you can watch the terrain park antics while you ride), then ski down to Montezuma lift, which takes you to the top of Dercum Mt. Or if it?s cold and you want to ride the Village gondola, you can ski to the gondola from the top of Peru. There was a bit of a line for the gondola at times (esp. around 10:00), but you can avoid long lift lines at the gondola and Summit Express lift (which are located together), by skiing into the Summit line on the other side of the gondola building (skier?s right). Other than this lift, there were minimal lines, so once we discovered this trick, we spent hardly any time in lift lines, even on a holiday weekend. The North Peak and Outback are especially uncrowded.
Re. good trails, I don?t know what your preferences are, but if you like a fairly steep pitch, but don?t like bumps, try the Go Devil run on the far skier?s left of Dercum Mt. (you have to ski through the A-51 terrain park to get to it) or Beger, closer to the gondola. These are the 2 blacks they seem to keep groomed. Some other blacks were either farily short (Bullet on the North Peak), or not terribly bumpy (Last Hoot on Dercum). If you like long, steep and bumpy blacks, I can?t help you ? those I avoid! For a long blue groomer, you can?t beat Elk Run on the Outback, which also has some nice bumps along the side, so you can combine a bit of mogul practice with a groomer run if you want. Santa Fe on Dercum is another good run to get some mogul practice on a blue, but unlike Elk Run it's all moguls.
Maybe others will correct me, but I?m afraid you won?t find the kind of steep discounts on lift tix that you?re accustomed to getting in Salt Lake City ? at least I haven?t been able to find these. But you can get somewhat discounted tix if you get them before leaving Denver. You can get them at different places, but we stop for groceries and lift tix at the King Sooper just off of I-70 at an exit called Youngfield/ 32nd st., I believe. They have 3 out of 5 day tix for $216, compared to $234 at the window. (If you want to buy in advance, you may be able to get a similar price at the Keystone website, but we prefer not to take the risk of buying in advance.) The same tix are also good at A-basin, Brek, and (one day) at Vail or Beaver Creek, so you can ski around, but we were happy for 3 days to stay at Keystone. We went to Copper in early Dec., and had a blast there, but they?re not part of this deal, so you?d have to buy separate tix if you decide to go there.
If your kids are interested in terrain parks, check out Freda?s incubator park, next to the big A-51 terrain park. It?s got a nice assortment of mellow jumps and small rails.
Happy to answer other specific questions.