For an all around motor, I would choose the Core Stock. The monster is High RPM, and not real well suited for truck, but I ran one in my truck, and it was ok.
I also have the Integy motor, and it is pretty fast, but has TONS of drag break. For Touring it might be good, but for truck, it causes too much rotation around the corners.
P2k is still a pretty good choice for small track conditions.