If money isn't an issue, I think the baddest motor for the truck might be a Plettenberg Big Maxximum. I've never had one myself but I've talked to several who have. It's a very nice motor and one that you don't see every day, which makes it even more cool.
http://www.icare-rc.com/plettenberg_cars.htm
Jammin CRT MM/Neu 1515 1700kv
Losi 8IGHT MM/Neu 1512 1900kv
Kyosho 777
T4 MM 5700
B4 LRP
XX4 MM 7700
old losi xxcr, MM4600 4s lipo 70mph+