Whats the major difference between Amapi 3D v5 and v6?? I'm just wondering if it's worth forking over the $200 for the upgrade....

It imports/exports wavefront obj files now, so if you want to make objects or morph targets for Poser, it's a lot easier now. Also, many of the tools have additional elements; for example, the primitive tool will make a mesh from a grayscale image. There's a wrap tool which will wrap an object around a sphere or cylinder, there's a tool that "irons out" the mesh or makes it rougher. I really like it, but go to the website at Eovia.com and check out the tour. It really details all of the changes.