Intermediate skier in the midwest using a 100+ waisted ski as a 1-ski quiver?? Not what I would recommed, unless I read that wrong.
At your weight, I'd look at some of the stiffer twins in the 85-95 waist range. All of them will sacrifice some edge grip on the midwest "hardpack", but will be more versatile for more conditions and they should be plenty for the occassional trip out west. The 95+ skis will work better in the softer conditions out west, but they can be a true handful in normal midwest conditions if you have less than stellar carving skills.
The K2 PE (Public Enemy) is widely available at a reasonable cost, or if you can find one since they've been discontinued a couple of years, the Volkl Karma would rock for your application (I believe the Wall or Ledge is the replacement for that). Another one to look at is the Head Monster series or the Fischer Wateas. Your best bet, if you can, is to demo everything you can get your hands on.