Well, if you're going show...18's for sure. 17's don't cut it anymore unless you're going with a JDM theme then 16's would be ok. Sounds like you're on the right path in the suspension department. Ever consider Volks? If you can...19's would be crazy and unique...no one really does 19's. However I wouldn't run it on the street. Show only.

BTW I don't think Mugen makes a rim in 17...highest is 16