You might also consider a Neumotor 1515/2Y with 6.7-1 gear ratio. It is on par with the Hacker power-wise and is less expensive and made in the USA. Has a finned case just like the Hacker. Check it out at www.flydma.com They have excellent customer service.

I have been running one for a month on 10s3p and makes gobs of power.

If you can wait a few weeks, you may be able to get a Castle Creations high voltage controller for a lot less money than the Hacker. I have the O-90 Hacker and it is expensive and sometimes hard to find.

You can also consider the Plettenberg 25-13 or 30-10 Xtra motors. No gearbox to worry about.

Jeff