I tore chunks out of my OE Michilins and went straight to BFG, but one more size up. I have ran the 285/60/20 (or is it the 285/65/20) for about 28,000 miles. I just went today at lunch and ordered the NITTO Terra Grapplers in the 295/60/20. They are 34.45" tall and 12.36" wide so basically a 35x12.50 and they will fit without any mods.
I do have the 2" front leveling parts in route to me now, just to make it have a better stance overall. That and my evil counter-conscience wants my headlights to be higher than they are now. I hate the way they have made the new style with blinkers on top.