I am going to order a set of M6 replica wheels for my 645ci (either Miro or Moven). Anyway, what offset would be the best for my car? Does the wheel stick out further from the fender with a higher offset? If that's correct, would an offset of 35 front/40 rear provide a slightly more aggressive look or would that just look stupid? I think there are other choices around 15 or 20. Should the front and rear be the same?

THANKS.