I currently use the XBR from Novak. The motor limit is only 8.5 though on the XBR. But this doesnt matter to me as that is more than enough motor for me. It works great. No complaints as of yet. I have seen issues with lrp escs and motors at my track. I have only seen 1 problem with a novak motor. So, I went with novak because of the name, reputation, and experience.

Now, if you want to go to hotter motors, ie 6.5 5.5 7.5 etc, you will have to get the GTB. The GTB has reverse profiles on it as well, but can handle hotter motors.

Good luck