TAMski--as a former coach of the Mahre Training Center at Keystone (nearly 15 years), I can vouch for that one--it's a very good program, grounded in the fundamentals of great skiing, and featuring, of course, Phil and/or Steve Mahre along with Keystone's top pros. I recommend the 5-day camp over the 3-day, by the way, especially for the first time.
Most multi-day special programs will probably serve you well. They usually involve the most experienced and effective instructors at whatever resort, and most result from some real effort to put together a cohesive, well-conceived agenda. I would also look into Lito Tejada-Flores' "Breakthrough on Skis"
programs at Aspen, especially if you consider yourself an intermediate skier, or the North American Ski Training Center (NASTC)
I wish you could join us in Utah--maybe next time! But there are indeed other programs worth looking at.