The flatness = glacial paths 

  Kettle moraine has some rather nice hiking trails.   Nice hills (Moraines) left behind by receeding glaciers.  We have one 'official' mountain - Rib Mountain.  Supposedly it barely meets the requirements.  The Southwestern part of the state (Lacrosse and south) were untouched by glaciers and are still relatively 'jagged'.  Nice non-flat area out there too.  Watch out for the true flatlanders to the south.  Heathens think Wisconsin is their playground.  We lovingly call them FIBs.
Anyway, Mosgood, Wisconsin is a decent place.  However, if you have children, I would suggest keeping them out of public schools 

  Tuition hikes for the UW state college system are skyrocketing every year.  
Burlington's location, Racine County, puts you in a decent spot.  45 minutes away from Milwaukee, about an hour from Madison (GREAT city, college twon; very colorful, diverse).  Of course, if you're into fishing/hunting, Wisconsin is the place for you.  The other week a few of us went out on the lake and caught a few 12-13" 
Perch.  They were ****ing HUGE.
Plus we've got Oshkosh an hour north of ya 

  EAA baby!