The main problem I have been having is with dynamic hair.  Like i said, hopefully now that DAZ has EOVIA, they will play together a bit better in future versions.  I haven't even started playing with HDRI yet.  I am still trying to learn how to use the vertex as opposed to the spline modeler.  I agree with you on lighting, Poser is a pain to use compared to C5.  I love the distant light function.  It makes getting realistic shadows a lot easier.  Does anyone know of any good tutorials on getting P6 Dynamic hair to look good in C5?  I have that render online now in my gallery.  I did all of the main rendering in C5 for the building backdrop, then just used the rendered BMP as a backdrop in P6.  I added the figure, posed it and did a couple of quick lights to get it to match the rendered backdrop.