I don't think you'll have a big problem with 17x9's on the front. The best thing to do would be 17x9's on the front and 17x10.5's on the rear. Better traction and a really aggressive look. Check out this site, browse around because they have a big selection of 4 lug wheels and all of their Cobra wheels come in 4 lug as well.
Mustang Wheels at CruizinConcepts.com