I have Poser 8 but still use Poser 7 because I just hate the new layout in 8...
But my main use for it now is just setting scenes up, I actually do my lighting and rendering in Vue 8.5 Infinite.
As the others have said though, it all depends on how serious you are at all this 3D stuff and just how much you have to spend, it can become a very expensive hobby if you let it..

Injustice will be avenged.
Cofiwch Dryweryn.