I'm considering picking up a set of volk re30's or te37's (GG evo, time attack 30's or mag blue te37's opinions here too

)
What it comes down to is - i'd like to have the most concave setup without getting super aggressive. I don't intend to run any radical tire or get the fenders rolled or anything. Stock tire sizes most likely, flush setup if possible - what rim size should I be looking at? Will I be able to get a more concave look with an 18" over a 17"?
I just don't want to deal with any rubbing or fitment issues / / spacers. Thanks =)