I preferred Studio 3 Advanced to Poser 7.....when I got DS4 it sped up and I was happy UNTIL I got Poser Pro 2012.  I have not looked back.  I think if you are new and want to use Genesis go for the free Studio it's great to learn on and you can make beautiful stuff.  However, If you are like me and refuse to let go of your V4 model and all the crap you just bought for her less than a year ago and don't want to buy it again....and want 64 bit support that IMO goes faster than DS4 I would get Pro2012.  Poser 9 was slower than spit for me.  Took it back.

I prefer the interface of Poser 2012 to DS4.  But all your stuff should work fairly well for studio if you go that route.  I mean it's free....get it!  Why not?    

The program is just a tool and whichever one you think will help you with your art more is the one you should go with.   

I just couldn't get Studio to render as fast for me anymore so I moved to Poser.  

And Poser lights will work in Studio 4....I experimented with all kinds of set ups that said they wouldn't work in there...they did anyway LOL.  

I had Reality...I never once got to make a pic in there b/c the darn things would never render fast LOL.