So I'm coming up on 21k on my stock Potenzas and they are just about done. I'm leaning towards Falken 452's since they are cheaper than the Hankooks and S.Drives I've seen recommended around here. So whats the problem?

I originally thought I was running 19's and was about to buy the Falkens when I thought I better double check the tires just in case. Come to find out I'm actually running 18's and now I have 20 inch fever. I've seen a number of decent deals in the classifieds but I don't know that its worth blowing $1500-$2500 on a set of wheels and tires rather than the $628 delivered but not installed on the Falkens.

Any thoughts to help the fever but save the bank?