Those Roush Rims are an awesome replacement for our Marauder, wish they would come in chrome thou.
Check out this web site for tires: www.tirerack.com For high performance, the Pirelli PZero should be a good choice, KennyBrown Marauder S uses them, just ask the owner (Mensrea).
I'm not sure what size he uses but I know they are wider in the back than stock.