Its interesting that losi states you can use 3s lipos on any of their combos. 7500kV @11.1V= 83250rpm!! The motors appear to be the same length as a velineon, so a little longer than a mamba so I would guess a little more torque. I might try one of the sensorless combos just to see what its like and if it really will handle 3s.
RC18T Mamba 6800, 4s lipo
Jammin CRT .5, Mamba Max 7700kV
Ofna Hyper 7, WS7 III
Kyosho Lazer ZX-5