Most people run a 275 or 285 on the front and rear on the stock 9.5" wheels. Those that want more traction often buy a replica 10.5" wheel to go on the rear and run a 305 or 315 tire. And few like myself go even further and buy aftermarket 11.5" or 12" wheels for the rear and use a 335 or 345 tire.
As for tires, so many choices depending on your goals. If you want the best street tire available for a daily driver or car that will be driven in the rain, its a Michelin PS4S and a very close second runner up is the Continental ExtremeContact Sport. When you get above a 315 tire size, options become much more limited to Michelin and Pirelli. For those that want the best dry traction available on the rear and don't plan to drive much in the rain, they often use Nitto 555R.