from memory...
18x8.5 and +30 to +35 offset (will either sit flush with guards or juuust peek out a lil and say "wasssup?") for front
18x9.5 and +30 to +35 offset rear for the same effect.
it'll maximise the space in your wheel arch, and go as close to your suspension without rubbing.
any less and it'll lack testicular fortitude.
oh and roll your guards, you won't need to pull em, but just roll it and lower your car. guranteed gangster.