Well I can't give you any info on the Marantz, but I just picked up a refurbed 525 from Onecall. It's driving M60s, M3s and a VP150, I've been afraid to see just how loud it can go. I get around +5db and I'm afraid the plaster is going to come off the walls!
I had compared the 325 against the Denon 2803 and even though the Denon was rated at 20 more wpc than the H/K, the 325 smoked the Denon in presence and power.
I ended up going with the refurbed 525, it was cheaper than the 325 locally. The remote could be better, but outside of that and the sound dropout when it changes decoding formats, it rocks. I don't think you can touch the output and features for the money. Just my humble opinion.