The LRP and Tekin ESC's are some of the best. But the new lrp 13.5 is not out yet. the 13.5's right now to get are Tekin, Orion and novak. I have the LRP Comp with an orion 10.5 and it feels very smooth with plent of rip for my T4. If i was to buy all new I would be leaning towards the tekin RS setup.
You may want to check with your club for racing it seams like the motor setup are 10.5 = 19T and 17.5 = 27T at lease for my area. and roar just set 17.5 as stock equal. just an fyi.