Paradigm and Anthem are the perfect example of a company that should really make speakers and amps and crossovers made for each other.
I didn't realize you were driving your surrounds with Anthem. I already own many of the Paradigm/Anthem active speakers and of course agree that they are made for each other. I don't think it matters if you use gen 1 or 2 in a surround system. Maybe a fun comparison to run your mains in 2 channel stereo mode and swap the solid state Anthem out with the BHK tube amp and compare the differences.