What Landy, only 3 "many's" I thought this question had been asked at least many x 14 times.First of all, welcome to the forum! This topic has been asked many, many, many times before in countless threads. If you visit the suspension and wheels and tires sub forums you'll find all of the answers you're looking for.
If you want to maintain the stock suspension ride, you'll probably want a spacer lift like a Rough Country or a Revtek. The most common tire size with a 3" lift is a 285/70/17 or 285/75/16
Good luck with your search!