Why so wide? I think the im72 is the best of the bunch unless fresh snow is over a foot deep. If the im77, the chip model is recommended. Here's one review that likes the im77chip a lot..."This is a fairly good choice for aggressive skiers who spend slightly more time off-piste than on and who are not addicted to bumps." Here's his review of the AC3..."Volkl skiers who stay mostly on the groomed will gravitate to the superb Allstar and those who ski at least half the time off-piste will probably pick the AC3, for similar reasons, chief among them versatility. In fact, Volkl could almost cover the entire spectrum of high-intermediate to advanced and expert recreational skiers with just these two models." Here's his review of the im72..."Head mints yet another potential classic. The 72 blends the best of the 70 and the 75 and adds a new feeling of responsiveness and agility. This is a superb ski for almost anything except out-and-out bottomless powder or 40mph back-country blasting."http://www.ts2003.com/members/index.html
I've been demoing skis, and I've leaned to go short if in doubt. I'm 6', 210#, ski all mountain at least as fast as half the skiers up there, and had a really fine demo day on 170 cm im72.