experience please?!? (tires & wheels)

i am getting new KYB shocks/struts/quad shocks installed b4 i get rims. I want 18X9 rims and i was wondering if they will fit without me having to roll the fenders. 2nd i was wondering what size tire to put on? i had some 17X9's and they had 235's (way to small). I was thinking 255's on the front and 275's on the back, but i don't know if 275's will fit in the back, should i flip the KYB quad shock to make it work? or should i just get 255's all around? or should i get a 17X8.5 wheel? I could opt for one of those instead....thanks for your time. all comments and experience appreciated!
 
i have kyb shocks, lowered, and 18x9 rims. im running 245 front, and 275 back without any problems. running 275 with quad shocks might present a problem though, and youll need to adjust your tailpipes if you have them.