I've been looking at the same tyres for mine (bar the BFG A/T which I don't personally like). I think (and I say I think because I've changed my mind more times than I've changed my socks over the last few weeks) that I'll go with the KM2's, my argument being:
Out of the 3 I was looking at (KM2's, ATZ 4-Rib & MTZ), I discounted the MTZ as the prices I've been quoted are $40/tyre more for the MTZ's than either of the other 2 and while I've not seen many bad write ups on them, I've not seen any evidence that they are significantly better than the KM2's so why pay the extra.
That left ATZ 4-Rib and the KM's. I've not yet seen a bad write up for the KM2's but the brain says go the AT over the MT as most of the driving I do is on road so in theory they should be quieter. The heart says go the KM2's though as that's what I really want.
I almost got the 4-Rib's but then I spoke to a guy who runs a garage around here who has run every brand of tyre going and says that both he, his brother and a few customers have found that the 4-Rib's start reasonably quiet but get very loud when they start to wear. Now if I'm only really running the ATZ as they're quieter and then find that they're not quieter at all then you have to ask what's the point. Just FYI, he recommended the Pro-Comp's, in my case the Xtreme AT. That is what both he and his brother are running now. Says they are much quieter and give good mileage. They do look like a great tyre but they don't come in a 265/70/17 which is the size I was looking for (could go to a 285/70/17 but really undecided on that as well) and they are $100/tyre more (for the 285/70/17's) than I've been quoted for the ATZ/KM'2 which just seems ridiculous.
So still stuck between the KM2's and the ATZ's but seriously swaying towards the KM2's. I drove a Rubicon JK in the US last year which was fitted with the KM1's and didn't think they were too bad on the road (feel, grip or noise) and the write ups I've read say the KM2's are better than the KM1's were so working on that theory then they should be OK. It's a just a lot of money to be putting down on a hunch!
And once I decide that then I've got to decide on the size. Again the brain says 265/70/17 as they the same rolling diameter as the stock 245/75/17's so will not give any issues with gearing or the speedo and will definitely not rub. However the heart says go the 285/70/17's but that throws a few more unknown's into the mix for me. Will they rub? Some say yes, some say no. Will they be OK on OE suspension for a while (I want to get a 2" lift fitted but unfortunately have to get the tyres first)? Some say they'll be fine, others don't. It's a damn mine field I tell you
As you may have guessed, this is the first time I've looked at mod'ing a vehicle in any way from standard so procrastination seems to be the name of the game at the moment.
Hope all of that is of some use