E30 Zone

I'm collecting my 1990 Diamand schwartz metallic m3 on saturday!! Cant wait.....
It has the standard 16'' bbs wheels at the moment but I want to get a set of 17'' bbs Rs or similar for it asap!!
I've seen these advertised in every variation of offsets and widths etc but what is the ideal setup for a non modified m3?

Thanks lads,

If the car is standard, stick with the 16" rims...
It will ride better and (IMHO) look better, too...

Only reason for bigger rims is to allow bigger brakes...