Ahh yes, it does get cold in Wisconsin, doesn't it? Probably not as cold as it does here in Minnesota, though, right?
I have a Gul Breathable dry suit, and I love it! It has a front diagonal zipper, and latex booties. The booties are great, because it means that your feet stay dry.
I have a buddy who's an avid windsurfer who swears by his Bare Polar Heat drysuit. It has heavy neoprene pants married to a non restrictive nylon upper. Add to that an included polar fleece liner, and I guess it's very toasty!
The important thing with any of the nylon suits, is that they're only as warm as wearing the proper stuff underneath. So if it's really cold, you'll want the fleece.
I find that since purchasing my Gul suit, that I never reach for my full length wet suit anymore. It's now an extra item for the ocassional suitless crew.
Good luck, neighbor!
Tim J.