I went with the 20's (08SRT Replicas) because to me it fits in the wheel well better. The ride is pretty good as it is but my plan is put Eibach lowering springs so I'm not sure how much different the handling will be.
I like the 18's too but I wish I could find more of the retro wheels (Like Foose, et. al.) without the higher cost and wait times. I love the fact that we all have different tastes. I also hope to attend a rally sometime soon.....
H76
