If you are still worried about the exterior looks, replacing the stock wheels with some decent looking 18s will improve the looks without hurting the ride too much.
I can't seem to recall how the ride was with stock 15s on the Camry. Hehe! It's been on 17s, 18s and 20s for the longest time, and I couldn't complain much about the ride. Went back to 18s, though, coz the 20s were too heavy.