I love my Ranger X2. The motors seem decently powerful for their weight, even on the hobbywing ESC. You can buy the motors direct from Backfire, or off of ali. This is not exactly what you are looking for, but it might put you on the right path:
I was actually thinking the other day of modifying some matrix II’s and mouting 4 of these motors on it. I was thinking for a carver though, not a true mountian board. Im not sure if these would have the torque or the grip.