I have a feelin you might not like this suggestion, but everything you said points to Blender as a possible solution. There's a few plugins out there that can import Daz content now, and it will probably be the most inexpensive solution. It has 2 native render engines you can pick from, and both are extremely fast and take advantage of your GPU for extra speed. One is basically a real time engine, and the other is Cycles which has been proven to be extremely good. Poser is actually using a customized version of Cycles for its default render engine now, Superfly.