If you go Tekin you will have to go with the buggy motor, truggy ones don't fit. Most the guys at the track run 2650's or 2050 on 4 cells with an RX8 but you will need some motor fans! I run a 6 cell set up with a 1700kv motor. The ESC runs cooler but the motor is just as hot.
Its a nice kit.. bought mine this winter and had it at 5 races so far and have yet to break despite hitting about everything out there.