@ Neox-- thanks man. about 75% of the model were primitives made in Max. I tend to try to stay away from any legit hard surface modeling in Zbrush because I have more control over it this way. The Skulls and horns were all Zbrush though, made from Z Spheres.
Racer, nice! How did you go about the grip? Zbrush noise? Drav, that looks great. You should use a sculpting app like mudbox or Zbrush to beat it up. Also, I would do that before you build a low poly so you know where to model major dents and damage.