Tekin, nice for boosted classes, not as smooth as others for mod racing (10.5 and lower) their new software is suppose to be better though. Had one, didn't like it much.
LRP, very nice for mod, smoother than Tekin, IMO. Still have 2 SXX v2's
Orion R10...nicest esc on the market IMO. Have 2 and will buy more if I ever need to.
Tekin RS might be the only one that would fit in your price range if you're buying new though.