"I was wondering should I add another 3D programme to the stable, into improve material editing, rendering and lighting." Sounds like you do have Poser 5. If that is the case then the answer is no. Just upgrade to Poser 6 and you'll get improved material editing, improved rendering and improved lightning. You also get Subsurface Scattering with it. As for Vue 5 Infinite or Standard or Pro, it's not worth the money at all when it comes to rendering. Imo the Poser 6 rendering engine surpasses the Vue rendering engine.

Artwork and 3DToons items, create the perfect place for you toon and other figures!

http://www.renderosity.com/mod/bcs/index.php?vendor=23722

Due to the childish TOS changes, I'm not allowed to link to my other products outside of Rendo anymore :(

Food for thought.....
https://www.youtube.com/watch?v=pYZw0dfLmLk