Looking for a good speed controler.

go on BriandG r/c calculation, and with your setup, if you use the jato single speed conversion (i hope you use it) your top speed estimation is about 117 m/h And your motor spin in the 63000 rpm range you'll destroy it !

Don't look for a better controler Just gear it 11/54 and you'll be about 39 m/h.
But, the problem with this gearing, is that you motor will it the tranny case, so the best thing to do is go for a 2s li-po, and your 5700MM motor will take a big breath of fresh air and apreciated alot and will spin in the 40000 rpm range. And you'll can gear it 16/54 and you'll not have problem with your motor hiting the tranny.