You would be good with motors around the 1800 - 2200kv in buggy.
The Castle 2200 is too long hence why guys have been using teh 2650 but most say its a bit too much power.
With the Tekin and Speedpassion combos you wont go wrong and they have excellent support if you do.
Speedpassion 8.5 or 7.5 motors and Tekin has a 1900kv that i have been told is a monster.