Hey, you can't stop here! This is bat country!
As your attorney I suggest the 8XL
Fun and joke aside, I have some 8XLs, 9XLs .... the 8XL is nice on 14 cells or 4S. Gets a bit hot if I drain some 8000mAh batts through it (have to give it a break halfway through the pack on hot days, no fan though), but a nice motor nevertheless. For that price, you can't complain.