Personally you can't go wrong with a site like the TireRack to see a preview of the rims on the car, but in all honesty call them to find out about things like offset and such...

I purchased my RacingHart's from a shop in Dayton OH, called the Wheel Source over the phone. I knew about what size and style of rim I wanted and they really hooked me up with offset and tire recommendations, top notch place if you are into tuner style rims IMO.

For something like your first set of rims an experienced shop is a must, IMO.

The rim tire package is the only thing keeping you on the road, it's a critical safety area not just pure bling...