If your range isnt limited, i say go Keyence, I have never heard one bad thing about a keyence, the only thing is they are expensive. After that I would say gtx, I have had a few novak things before, and I would have to say its all top notch stuff. After that, Id got with a KO esc. I heard these are just as good or even better then the gtx. Then lastly i would say the LRP Quantum Competiton 2. These are decent, but I would rather get the ones above first then the Q2 .
Thats just my 2cents.