I would go for a bk 3695 and a Neu motor. Enables you to use motorbrakes for a tad more money.. Shoot Mike an email, i am sure he can help you out, i think he has got something laying around..
The BK 3695 is only good for 42K rpm with a 2 pole motor. I have one in my Ofna buggy with a Hacker C50 13L and it almost at the rpm limit. That Jazz controller is a well built machine. You will like it a lot. I have a few of them.