2007 tahoe 20's tire question.

I am buying a new tahoe thursday and want to get 20's. My question is about tire size. The Wheels are 20 x 9 and I am leaning towards 295/50-20 but dont want any rubbing or have them stick out too far. Or possibly the stock size 275/55-20 any experience or advice would be grately appreciated. Thanks, will post pics soon