Ill be Wisconsin next month. I'm still fielding course 500 recommendations, although it needs to be within a 90 minute drive of Fond du Lac. (Winter Park, Silver Fox, Grey Fox, Silver Creek, Stoney Creek, Brown Deer and Heistand is what I'm pondering as options thus far.)
Here is the TR top ten (min 5 TR reviews.) Lake Marshall's Lions Layout is rocking a 5.0 with 3 TR reviews.
these might be fightin words to some and from a spoiled minnesotan but all the madison courses were average
i wouldnt feel comfortable recommending any of them to you as a 500 course milestone