here's what I did.. widest, lightest, best value square setup I could find.
17x9 Arc-8s w/ 255s on all corners.
http://www.e90post.com/forums/showpo...8&postcount=51
it's not the most 'stylin' setup out there, but it sure handles a lot better. Killed the understeer and rides a ton nicer with about 25% less unspring weight.