RE: Electric Power Setup
I've used the E-Flite Six Series motors in 1/2A's. The 2700kV on 3S and a 5.1x4.5 APC prop is pretty sporty - 206kph on an ACE Simple 400 for example, unlimited vertical. Great fun. The 2000kV is probably more sensible coupled to a 6x3 or 6x4 prop.
I don't think these qualify as Cox substitutes, more like .10-.12 performance. But, you have the virtue of a linear throttle.