Cool topic. Following are some of the best available in Wisconsin these days. Sorry for the lack of IPAs in this list -- it's MY list -- but if interested, you really can't go wrong with anything by Ale Asylum.
Lakefront - Riverwest Stein Beer (this is my absolute favorite local lager)
Copper State - Rugged North Lager
Badger State - Bunyan Badger Brown Ale
Ale Asylum - Ambergeddon Amber Ale (very hoppy)
New Glarus - Moon Man Pale Ale (or Spotted Cow, I guess, but Spotted Cow is really NOT great, even asked Dan and he just says "well, it pays the bills")
Karben4 - Lady Luck Irish Red Ale (best red ale you ever had, I guarantee)
Honorable mention, maybe surprising to some, is good old Leinenkugel's Honey Weiss. It's a damn fine beer, I don't care what anybody says.