I don't usually recomend stuff, but my goodyear mudrunners are the cats meow.
Great on hard pack, great in the mud. They just plain work.
The only moan I have is the size on stock rims. My front 26"ers are closer to 25" and my back 26"ers can easily be pumped to 27". When I buy my next set (for next 4 wheeler) I will try 27" in the front and 26" in the rear. With proper air they should both measure 26.5"

 

I forgot to mention how easy they make the front end steer. My friend whod drives a grizzly is envious of the steering ease, and mines a full time 4wd compared to his 2wd.!