you could run 255x60's or 275x60's or go to 295x50's.
Depends how tall you wanna go and how much room you have in the wheel well.
255's are 27" tall
275's are 28" tall
295's are 26.5" tall
If you want a taller tire you might find a 285x70 which is 30.5" tall.
Search on tirerack.com to compare.
