Do you need P5? What do plan doing with it? Stills or animations? If animations ask the animators, if you do stills do you use Photo shop to paint hair, clothes, filter, blur,dodge, and burn? If so stick with P4 or Propack. if you want 3d stills with great textures and effects get P5. Poser 5 is not Poser4, take time to learn the software, get organized and stay organized. I have Poser 5 on 3 machines, and I have had few problems, and would never go back to P4.