i have the KDW2 and love them, make sure you get either tire from tirerack.com and buy the insurance. i have had two sets replaced for free from road debris, no questions asked.
i have staggered sizes, and have not had a problem with getting them replaced. they have even replaced both tires (driver and passenger side) when only one has been damaged. best money i have ever spent.
On the left side of the main TireRack screen click on "Tires by Size", then on the next screen you have dropdown boxes to select your size...under it click on "Different size for rear tires?". This will give you your size choices for both front and rear, it will only choose matching tires and it should give you the Road Hazzard option.