Great Lakes cruiser
You might want to consider some of the most popular boats on Lake Michigan - Catalina, Ericson, Tartan, Hunter, for instance. A lot of these boats are/were sold locally and are serviced by marinas who know them inside and out. You would never have a problem finding somebody with experience to service any system on any of these boats. Also, these (and a few others) have large communities of devotees so there's a good chance you'll be able to talk (and sail) with somebody who has direct experience sailing the same boat you have.
Good luck in your search!