I put the Dunlop GT 501's on my KZ 700 and love the grip and stability they provide, they are also the only tires in this size that are V rated so your high speed runs are totally worry free not to mention the extra stiffness they have cornering is way more confident.
I've had the bike over 125 mph with these tires and smooth as glass the whole way, the bike wanted more but I had to back off cuz it started to rain. i normally cruise at 80 on the highway so I wanted a tire that could do it all day with no complaints, this tire definitely fits the bill here. Wet traction is also excellent with these.
I got mine at Cycle Gear and they costed about $275 for the 2 tires, mounting and balancing with full road hazard warranty.
You can buy them and mount them yourself and save about $75 but some things are better left paying others to do for you.