Ok- besides the dollar figure, you forgot one VERY, VERY important piece of information- what are you going to be doing with the Jeep? If you're mainly on-road, the ATZ's are certainly your better bet.
If you're going to be in mud a lot, the KM2's are your better bet. I run them on my daily driver, and they are a compromise vs. an all-terrain. I get worse fuel economy, worse handling and ride, and more noise. I'm willing to accept this for their capabilities off-road. You need to decide that you are REALLY okay with living with those compromises before you pull the trigger.
As for mounting and balancing before shipment, it works just fine, as long as none of the weights come off during shipping. I say run them, and if they wobble, a re-balance isn't too expensive- Mark W.