The pro verson of poser is great for rigging and as of yet have not rigged a character in daz.  As jammixx says Daz 4 is free for now.  They are coming out with an advanced version which I believe will also be both 64 and 32 bit, and stronger then the free verson.  I do believe by the emails that a free verson will remain free.  Don't hold me to that though. 

A new verson of Poser is also coming out, or I should say two version.  Version 9 and verson 2012.  From what I am understanding by reading forums and what not, there is a rift between Daz and Poser and they won't be as compatable as they have been in the past.  Poser pro will have simular rigging as genisis but I not sure if genisis figures will work in the new poser and likewise.  A sad day for some of us as we will be forced to choose which one has what we want most.  Like the new mimic live.  It won't work with poser figures and is not a stand alone product so can't be used with poser at all.  I'm not sure if you save anything in daz 4 to poser format.  I have been out of commission and in the hospital so have not been able to try saving anything in it to poser format.  When I do I will let you know.

Oh by the way if anyone is interested Smith Micro is taking advanced orders on Poser 9 and 2012 at a good discount for ligitiment users, as well as good upgrade prices.  I am not sure if I would be allowed to post prices or link as I am not a promoter for them, but simply want to pass on what I have learned.