i've found alot of success with the feigao 8xl. it's a 2073KV motor :
http://www.offshoreelectrics.com/pro...prod=fei-540XL
it's comparable to speed and power with the neu, but it dosen't have anywhere the effeciency the neu's or medusas have for longevity in a race in terms of temps.
if you gear low and run small tracks or bash, then the feigao's are fine. if you're looking to run mains at your track, you can't sacrifice in that department, and you should go for a neu or medusa.
i've had several medusas, and while they have a ton of torque, it sorely lacks in top speed imo.