I looked at that option. I was turned off because the MDX rim is only 6.5" wide like the Pilot's and Odyssey's. So, all you gain is a bigger wheel and less sidewall. No appreciable width. I'm opting for 17x8's so I can put 255/60-17's or maybe even 275/60-17's. These would be the Michelin Cross Terrains which, after much research, am convinced is the best all around tire for this vehicle.
Discount Tire (tires.com) has a very good selection for the Pilot.