[sean10mm]

The 335i is not in the same performance class as the M3, even if you slap on every M Performance upgrade they've got. If you want M3 performance get the M3.

And out of curiosity, why do you want 20" wheels? They're just going to make the ride worse and be more prone to damage without any performance benefit in return. Nothing wrong with getting them for looks, but if you want function then super-light 18" wheels are a better investment.

If you want more bang for the buck I'd go with a sport line with the staggered wheel option, or an M Sport with the standard staggered 400M wheels and sink the savings into the M Performance suspension and/or the M Performance power kit.