I chose the novak brusless system because they sell theirs in a dedicated 4 cell version with speedo and motor combo for a nice price. and the best part, flawless performance and no worries about compatability problems. i've been very happy with mine (which came with their 10.5 motor that's about the same speed as a fast 19 turn brushed motor but far less maintenance intensive......ie no maintenance required)... It's a simple plug and play system.