Dude, I know everyone just about is going to tell you to lift before that. I had 33x12.50's on 15x8's stock with just the torsion bar almost maxxed out. They will rub, but ONLY at the back part of the front flare. Unless you are turning full-lock you won't rub, and even then you can trim the flares to make it stop rubbing. I'd go ahead and get the tires, put 'em on, and start saving for the lift.
And here's my trimmed flares, they didn't rub that whole trip.