Hi lululee,
I agree with what Rutra has said (he's usually right! :-))
It's a difficult decision to make, I sidegraded to Complete from 6 Inf, then regretted it because I missed the comparison point about changing exposure and contrast for environment maps, which I use a lot in 6Inf. At the moment I'm toppling on a decision to change from 7Complete to 7Infinite because of this, and will probably go to 7Inf (if e-on let me, which at the moment is looking good (pls. keep your fingers crossed for me)
As far as the question of staying with 6 or updating to 7 is concerned, the anti-aliasing is VERY much improved, and the depth of field as well. Both very interesting for figure studies.
If you don't do animations or compositing, then Complete could be very interesting. However please bear in mind what Rutra said about the number of cpus - this also includes the new (4) core i7 Intels, which thank hyperthreading are seen as 8 cpus....
Also, officially, there is no upgrade path from Complete to Infinite at the moment.
Regarding SkinVue, I can't make a comment, but there is an identified problem using Poser shaders under particular conditions - it has been identified, and I am confident that it will be addressed (it seems to be a problem with Smith Micro's Development Kit, they're working on a fix together)
Maybe the advice is to wait a little bit before deciding? - dunno, but I am convinced that Vue 7 in one form or another is/will be worth it.
Hope this helps
Rob

P.S. Like your Gallery themes :-)