Help with LST2 brushless motor choices

I'm trying to figure out what motor to put in my LST2 brushless convesion. I have the FOC and the TiNi gears spur/pinions. I got the Dude's motor mount and a couple of 6s 5000mAH 25C LiPos. I gave up on mech brakes so I need a setup that can handle motor braking. I have a Tekin RX8/ 1700KV T8 but I don't think this will hold up. I was thinking a Neu 1521/1Y/F but they ain't cheap. Now I see the new Castle 1518 and 1520, which are cheaper than the Neus. Is the T8 or 1518 up to motor breaking a 13+ lbs MT? I'd like this set up to be as bullet proof as the standard nitro LST2.