Backcountry near Big Sky

My family has decided on about two weeks at Big Sky, with side trips to
Bridger, this February for our annual resort vacation.

Does anybody have recommendations on backcountry t'marking or snowboarding
in that area. We will be two experienced, experts with plenty of winter
mountaineering and off-piste experience. We are interested in guidfed days
hiking for as much as 4,000 or 5,000 feet of turns and in terrain that could
be reasonably exploited by first time visitors in the area. Is Yellowstone
all touring or are there any worthwhile vertical challenges in there? Guide
book recommendations are also welcome.

Thanks.

Tommy T.