According to TIRE RACK, there's a couple of possibilities. A 225-50-16 for both front and back or and even larger 245-45-16 for just the rear. The aspect ratio of 50 or 45 will give you less sidewall around your wheel so it would look better plus lowering it would take all the space out the wheel well around the tire.
Those are the recommendations of Tire Rack...they didn't mention on their site about the rolling circumference and weather or not your speedometer will be off (as Mike pointed out) with those sizes. Give em a call.
