I was in the same boat last July. I liked the KO2's, but wanted to try something a little more aggressive.
I ended up with the Mickey Thompson Baja ATZ P3. I typically hit trails with a friend that has a FJ with 35' tires and is also running the ATZ P3's. He had no complaints and so I went off his recommendation, which i am glad i did.
With that said, there are a ton of people in LV that are running the Wildpeak AT's and seem happy with them. If i wanted to stay with a AT, it would have been between another set of KO2's or Wildpeaks.
Mickey Thompson | Baja ATZ P3™
