JH is great for an upper-intermediate skier. it's a mountain for experts, though, for sure. since you wouldn't be hitting half the mountain, you could probably find something that would be just as great an experience without spending as much $. JH is pretty remote and expensive; there's snowking in town (local hill) and Grand Targhee an hour over and around the pass. intermediate cruiser heaven there. again, JH has limited access (expensive flights) and it's a pretty expensive area overall.
still, you'll have a great time if you go- the scenery, skiing, and vibe is tops. though, i must concede that you could get a similar experience in more exotic locales for about the same or less $ (i.e. fernie, red mountain interior BC) or maybe even Big Mountain montana. or, perhaps PowMow- Powder Mountain, Utah- nothing super steep- but super huge area to ski and tons of snow (about as much as alta)- with, perhaps, the least crowds you can find anywhere. period.
just my .02- wherever you go, you'll have a blast!