18's FTW if it's looks your after. Check out how my wheels look bigger and fill the arches more than the rest (and thats with superlows, imagine coilovers.....) some of the other rims are 18's but the style of rim plays a big part on how big it looks
If handling was your priority I would go 17's with good quality rubber...
Just my 2cents worth....
Scooter.