Cant believe im going to beat Nick on this one..
Brushless motors are rated in RPM per volt. If you find a 1k Watt motor.
For example this one is like the one Nick uses:
http://www.superfastrc.com/feigao-5408408xl-.html
its 2074 RPM per volt. on 12 volts it would near 1k watts at 80 amps.