Time for PolyMaxx to go 24v brushless!

Hey everyone! I figure with my new polys configured for 24v at 4.4 amps (6s) it's time to convert the "PolyMaxx" to brushless!

I've been looking around and found it hard to find high voltage brushless systems...but I think I found a good esc/motor pair - a Warrior 9920 and Lehner XL 1600 motor.

Before I plop down $350, does anyone see a problem? Any performance estimates? I'm well versed in the brushed world but not so in brushless...so I need some guidance. thx!