Thanks for the info!
I'm going with the following setup:
Eflite Power 110 motor
Castle 85HV
2 5c Thunder power 5000 mAH in series.
Thinking of a 18X8 APC.
According to the motor calc: http://www.brantuas.com/ezcalc/dma1.asp
That'll give me 81 motor amps, 2315 Watts, at 8521 RPM, runtime of 7.2 minutes.

A 17X8 gives me 70 motor amps, 2066 Watts, 8853 RPM, runtime of 8.3 minutes

Am I pushing it?

Thanks for the advice!
Dave