I was hesitating to reply, but I have to realize that Chord is quite unknown here.
I'm sorry that I can't comment on the CPM 3300.
But a month ago I replaced a Krell FPB 300 with a Chord SPM 5000.
The Chord is superior by far - much faster, more transparent, and has much more control over my watt/puppy speakers. I thought that improvements of this magnitude were not possible over the fine FPB 300.
Chord uses leading edge power supply technology, which makes this excellent sound possible with smaller and less heavy amps - my SPM 5000 doesn't even get warm after long listening hours.
So I have an advice: give Chord a chance. Listen to it with your own equipment. And tell us about your findings.
Good luck - Uli