17's are about perfect. 18's are a little big so tire and ride height are more important. But as the thread suggests, tire selection for 17's is getting a little limited. 17's with ~26" tall tires is the way to go IMO, but it's getting harder to find the right widths to do that.
14's, on the other hand, look stupid. :poke: But I don't post that in every person that runs 14s' thread. He asked about tires, not your antiquated opinion on rim diameter.