The bolt pattern is compatible. I don't see anything 1/10 scale sensored packages that can handle 6S. You could mate a 1/10 scale sensored can with the RX8 ESC but that is still in the $300 range.
thanks for the help dom, i decided to go with a holmes hobbies setup instead. It will be crawling more than anything and i couldn't see spending over $300 on the motor/esc for a trail rig.