SouthHaven (
http://www.gingermanraceway.com/) about an hour farther than Grattan.
Grattan is definately my favorite, it just flows better. We will be there July 31 and Aug 1st.
Gingerman is a "thrust and brake track" and doesn't have much flow to it, pavement has these little ridges that are unnerving until you get used to them. Don't have any dates set for Gingerman but they will have open track days and we just show up.