I haven't used the geared Mega setup, so my opinion ain't worth much.
I reread Shawn's setup in his absolute and he finally settled on:
calc programs, adding the $$, readding the dollars and talking to various people in person on the phone and through ezone. With all that done I've taken the plunge and have just ordered from Nippon Dave the motor, speedy, prop and spinner. Setup is going to be
Aveox 3.7:1 gear box (P37)
14.5x10 Falco carbon prop
Jeti Advance 70 opto
10 CP1700 cells
Figures from both p-calc and e-calc suggest about 60amps draw with 100ounces of static thrust
He reported being very happy with that setup. I can also say that if you have a brushless controller then the Elios 37 with included 3.7 gearbox from www.flyelectric.com
at about $US210 will give good brushless performance on a 14x10 prop. I have used that setup. Its not as good as my current setup, but its certainly good for up to 70 amps and probably 80-90 briefly.
Goodluck with your choice