This is really a 'each to their own' type thing, i have a 94 eg6 in red dropped 50mm on 17inch bbs rims (silver) and i love it, i like big rims on cars. so for me 17's wer the best compromise (15's or 16's for performance, 18's looks or 17's compromise) Your car has a 4x100 pcd and 45 offset it wont scrub the archs at all with a 50mm drop and the correct offset. It will look abit high untill you lower it (4x4 look) but if your buying rims get the ones/size YOU want, if you get smaller rims then lower it you mite wish you'd got the 17's! than ur gonna have to get new rims agen!! lowering your car isnt too expensive either - spring kits are only like 100 pounds!
search on google for pics and see what you like!! i'll send pics of my motor if you like! good luck!