Jim, I noticed Peter's comment on the Sultan 85 and I noticed Ron's commennts on the Pilgrim giving nothinmg up on the groomed vs the IM 78. I have not been on the pilgrim or on the Sultan 85, but I know enough about skis and physics to know that when you make a ski wider you have two choices, make it stiff or make it softer. The only wide skis that I have been on (85mm waist to 95mm wiast) that actually railed like race skis on groomed terrain are stocklis. They absolutley rocked and the 95mm stockli that I skied felt like an even better carver than the IM78. It actually was much tougher to bend but on edge it railed at speed like a GS ski, with incredible stability. Enough that I was thinking I should buy this ski. Now here is the problem, for me, at my ability, it was a one trick pony. It was a 95mm GS ski. When I took it into off piste terrain it was almost unskiable. If I got back slightly on the tails it would buck me like riding a bull (not that I have ever riden a bull but I imagine this ski was close!!).
So here is my point, if a 90mm ski is not super stiff, it won't carve like the IM 78. If it is ultra stiff, you are better off owning a GS ski, because that's how versatile the ski will be. Nordica makes alot of these skis, the Hellcats come to mind (I have only been on the one with two layers of metal and it is unskiable off piste for me at 180lbs). The IM88 is a great example. It s a great ski, and maybe the best crud and chop ski ever made. And it rails on gromed trerrain, but I can't bend the ski. I am locked into one turn shape in carving. off piste it is skiable, but not anywhere close to forgving. (The new peak 88 will be interesting to try because it is supposedly less stiff)
Clearly the trend is for everything to be wider and many people ride 90-100mm skis as their everyday knock around skis and that's fine. But the idea that these skis will do the same as carvers (65-75mm skis) or midfats (in the 76-82mm range) is just falacious marketinng. This is not to say that they aren't making some great truly verstaile skis, but I have yet to see a 90mm ski that can do what the IM 78 can do with regard to the groomed and versatility.
Of course it all depends on what one wants most in their do all ski.