I would try working with DS4.5 Pro (free) a little first, using V4.  There are some really good features.  Of course, there are some features from Poser you will miss.

If you find you can work with it well, and like it, then I would say V5 is a worthy purchase. (though now maybe wait unitl end of MM to see if she goes 50% off again)

If not, then maybe not worth it, but perhaps you can give DSON a try and see if you can get it to do what you want with default genesis and some converts.