If you look at my thread I am using the XXR's and I have no problem with them. I have the 18x8.5 w/ 245/40/18's anyway no problems here with XXR and everyone has a different budget so do what you like. also just a quick note 255's equals rolled finders and i had to roll mine with 245's with 35 offset.. I also asked the guys that I bought my rims from to come and post some specs on XXR's for you on the forum.
08 sti red deep dish rims
http://forums.nasioc.com/forums/show....php?t=1797104