RE: Volcano EPX motors
leopard 60amp brushless ESC with either a 3300kv to 3500kv motor.
The system (motor and esc) run $60 on hobbypartz.com.
that system is very close in performance to what the brushless version volcano comes with.
If you wanna stay brushed, then a axial 27, HPI saturn 27t or basically and 27t motor will do the job.