Funny, I've been wanting to move to Colorado for some time.

Nothing wrong with Wisconsin; it just doesn't have my mom in it like Colorado does.
Anyway, if you don't mind Winter, Wisconsin is really a great place to live. I've lived both in the east (Sheboygan) and in the west (La Crosse). I much prefer the west side of the state. The scenery is better (not so flat) and the cost of living is lower (at least between the two cities).
The Dells is a great place to visit but I'm not sure I'd want to live near there. From what I've seen (as a visitor), it's pretty dead in the Winter and overrun with tourists in the Summer.
Michelle