[jhautz]

I run a Hacker 8L (basically the same as the feigao 8L) on 3s with stock tires/chassis/arms and a 20T pinion and it is a little rocket. Around 45mph. The motor never gets hot no matter how long or hard I run it. I dont really bother temping it cuz it doesnt ever get hot enough that I cant just hold my finger on it.

I personally dont see the need for a Neu in the CRT.5, it runs fine on the cheaper motors.

That said. I think any of those you listed would be fine.