I am thinking of upgrading to the chrome 5 star C5 wheels.  I have seen them sold as 18x9.5 rear and 17x9.5 or so for the front.  Do you recommend wheels that are completely the same all the way around or ones that are  slightly smaller in the front.  What are the advantages to both?  Also, is there a way to fill out the fender wells without lowering the car.  It is already picky where you drive.  I can't imagine it any lower.  Thanks