I grew up skiing at Snowmass and have since been to about 25 other western resorts.
The Elk Camp area and Naked Lady are not particularly difficult relative to blues at other areas. Therefore, your group (at least those at lower end of the skill spectrum) would probably find the blues at a place like Snowbird a little too challenging.
I would say Steamboat might be a good area for you to check out. The part of the mountain the locals refer to as "Wally World" is a pleasant large area for cruising similar in difficulty to Elk Camp. It also has a lot of on-mountain lodging like Snowmass.
Another one that's more off the beaten path is Big Mountain, Montana. It's not nearly as built up as Snowmass or Steamboat, but it would be a very nice area for intermediate skiers.
In Utah, Deer Valley (expensive but renowned for their groomed slopes), Park City, and Solitude (smaller but less crowded) would also be possibilites.
I haven't been to Heavenly or Sun Peaks, but I would agree (at least based on the trail map and reputation) with the earlier responses that these might be worth a look.
[ January 28, 2003, 10:47 AM: Message edited by: Wags ]