It might just be a good idea to wait. It's been two years since Poser 5 came out, and it seems like most online stores or Poser merchants still don't properly support Poser 5's features. For instance, I'm hopping mad at all the work I need to fix bump maps in MAT Pose files. Curious Labs did say Poser 6 will really just be a fixed version of Poser 5. I refuse to pay for a bugfix!