I have found that my car does not understeer nearly as much as the e46 M3s that I have driven, but I do enjoy the ability to rotate tires. I'm in the same boat as you, afraid to mess up my Volks, so looking into a set of the ARC-8s, especially with the insane group buy pricing! I think they're the best bang for buck, and if I happen to nick them, I won't feel as bad!!
Looks like I'm probably going to go for a squared setup to see if it'll improve my time, and to help the tires last a little longer