since you have arc 8's, I think the coolest set up would be a set of 17" rear arc 8's with drag tires that you can throw on for events. Obviously it's the most expensive route, but think how cool that would be to have a set of 17x9's wrapped in ET street R tires in 275/40/17 that you could throw on for events, and throw your 18x9.5's back on for the street. it Would look sweet with the car as well and match!!
http://www.mickeythompsontires.com/strip/et-street-r/