I would go with the Kenda Kutters or Razr. I have the razrs now and like them but I think I going to go with the Kutters next time. xx700xx has the Kenda Klaws and he loves those. The Kutters are just like them just a little beefier.
I bought my XX used and it came with Razr II's on T-9 wheels. They are an excellent tire, but for the price of them I will run the stock wheels and tires while riding near home, and switch back to the Razer's when I go to a riding event. I've had the original Razrs on my previous sport quads and have nothing bad to say about them.