4, 5 and 6. 

A combination of P4, UV Mapper and Phi Builder is the quickest and most accurate way to create rigged characters for Poser, imho. In P4 I can move an object around with Joint Editor turned on, making accurate fall-off's easier to get right. I've never been able to move characters around when the Joint Editor is active in any other version of Poser. I doubt I'll upgrade Poser until we get better rigging options.