I use a Novak havoc stock spec esc with a 10.5 ss pro bushless for my basher/drifter. Local club have let me run it in their stock class a couple of times as well, but if you want to be safe go a 17.5 depending on what your local club runs as stock, you can just gear it to be competitive.
If you go for a stock spec esc or "blinky", it will be cheap. My Novak was $150 on www.amainhobbies.com
They also the the speed passion cirtix stock club race for $99.
Both are a sensored setup, so will be smooth for drift.