Ok, the only real difference aside from price is 2wd for Rush and 4wd for mt2. I have an original rush and i love it. I had a pro 2 but wasnrt very versatile, so i found a brand new rush for AU$200 (about US$155) on ebay. I have since hopped it up, because parts are pretty easy to come by. So your choice is basically 2wd or 4wd. And this also depends upon your budget, but if you just getting started i would probably recommend the rush, its cheaper, easy to maintain, and is easy to customise later.