as Zmuff correctly states, its the whole set-up that matters. Tire sidewall height, shock type/damping, and spring selection all have a major influence on ride and handling. Personally, I opted for the factory M-technic sport springs and highly recommend them with Boge Gas shocks to keep the damping down a bit. Although I run the std. 225 60 15 wheel/tire combo, I believe this would be a particularly good set up for + wheel sizes.
HTH,
George