Call CycleGear in Norfolk and see if they have the 120/160 or 120/170 combo you want. Put your bike on stands and pull the front and rear wheels. Take the wheels to them and they should get you taken care of. They usually give a discount on tires and their install is about 10-15 cheaper per wheel if you buy the tire from them.

Even though it looks like you save money buying online, mounting and balancing the tires usually catches up with you...

+1 on the Pilot Powers. The EX500 and the F4 both have them now...