Here's an easy one (I think)

[Omicron]

I did a wetsuit for a year.  Then I went on a dive in November with my friends, dang near became hypothermic, saw my friends still diving in comfort even later in the year while I was landlocked, and bought a drysuit.

It depends on how much you dive really.  Instead of decidinfg now, you may just want to try and find a rental that fits "pretty good".  Dive with it for awhile, see how addicted you do (or don't...) get.  Then decide on the exposure suit.

Looking back, I wish I would have just bought a drysuit from the start, but I couldn't justify the initial cost of it when just getting into diving - so I understand the hesitation.  But now, my 7MM suit hasn't seen use since I got my drysuit, so I would really advise to think about spending money on a high-end wetsuit for Wisconsin.

The problem is, most good Wisconsin diving is coooold - too cold for a wetsuit really.  You get below the bottom thermocline in red granite, wazee, etc, it's 42 degrees, year round.  So even though you spent money on a high end wetsuit, you are still going to be uncomfortable at times.