If you plan to race a blinky class, then I can recommend the Hobbywing XR10 Justock. Inexpensive and bullet-proof.

I have also used the Hobbyking 80A Turbo ESC and have two, one in a 2wd Slash Mud Boss and the other in a 2wd Slash dirt racer. Slight larger than the XR10 and you will need the program box to change settings. Also bullet-proof so far.