Staying in Summit is a quite a bit more of a scene than in Winterpark. Lot's more to do after the slopes close around there. Plus you do have multiple resorts to choose from. Copper is also located in the area. Vail is about 20 minutes or so from Keystone. If you wanted to re visit Winterpark, it's close enough for a day. If your group is going to be of drinking age, not a bad deal. If not, it's still decent, buy you may look at packages in Utah too. I guess if you are bussing in Colorado would probably be the least expensive, but lodging and lift tickets tend to be cheaper in Utah.