I see...i wouldnt know about the 316BEE but at least it has double the power of 3020 which would be better for those diamonds. My first amp was the Nad C340 some years back, which was fine, it was powerful but felt the sound was a bit flat and not very exciting to listen to, which kinda put me off the brand. The PM6004 was the opposite, hence why im more inclined to the Marantz amps, I was so please with the sound i upgraded to the PM8005 a few years later which is just brill.
What have you got at the moment?