I'm going through the same decision. Its hard to beat the MT KM I've had many sets on all my different rigs and they've always held up great tot he road use and performed well the trail. I really want to try the KM 2's and another member in the club has the Toyo's on his 100 series and 40 and he has mad traction with them. I've been leaning that way but to justify the cost over the regular KM's I'm having problems telling myself they're worth it especially on my 80 which is my DD.

I currently have the geolander AT's they do ok for light trail and road use. A friend is running the Yoko MT's but I haven't seen it on the trail so I don't know how they do.
Toyo's
Yoko MT's