I highly recommend the Vail Marriott as it is one of the best return on your points IMO. However, you may have waited a bit too late to book award stays at this property. You might be able to find 3 or 4 nights together in January, but that will probably be about it.

I also recommend Whistler-Blackcomb Residence Inn as its slope side location is excellent. WB can be hit and miss on the snow department with its lower altitude. I have skied there twice, once it was great and the other time it sucked big time. You will probably have better luck getting awards at this property.

Any of the MVCI properties will be tough to get, but you can always try. There is Breckenridge and Park City. There is also Vail, but I don't recommend that property. Breckenridge was renovated this past off-season so I am eager to see what it looks like now. It was looking a bit worn out.

Park City Marriott I know very little about except that my boss and his wife stay there each year for Sundance. They like its downtown location.

Next year there may be a Residence Inn at Vail. http://www.vaildaily.com/article/20071024/NEWS/71023038