I'd go with Poser Pro or Poser Pro Base if I were you.  Only costs a little bit more
and you get more features.  If you already have Poser 6, Poser Pro Base is $149.
While Poser 7 is $129.  So for $20 more you get  a 64 bit render engine, network
rendering, animation layers, gamma correction and everything in Poser 7.
PP is sort of Poser 7.5.