1515 vs 1521 in a LST???

[lincpimp]

So i have had great succes with my 1515 1.5d in my erevo and was thinking of buying a neu for my Aftershock (lst based truck). Setup will be a MMM on 6s lipo. 4500mah 30c pack made of enerland cells. I have set the tranny up as forward only, and have a TDR single speed hub. So basically it is locked in 2nd gear, so I can use motor brakes and reverse. Gearing is 24/59, with stock tires and a 1500 kv motor it will be setup for around 42mph.

Sticking with the listed setup as i plan to try my hacker c50 11xl in it before I buy a neu. It specs out very similar to a 1521 1y or a 1515 1.5y.

So I am wondering which neu would be better. Having them geared the same, with very similar kv, I am guessing the 1521 would be a better choice. The aftershock is a heavier truck than the erevo, and the wheel/tires weigh more. I am looking for good temps, around 160f would be nice.

Maybe someone can tell me what wattage range the various neus are good for? Since the lipos are good for 120+ amps cont, what motor will be good? 3hp somds like a good number, which would be around 100amps at 6s lipo.