Tube technology Fusion Cd64 any good?

If your NT4000 has the upsampler and better tubes (Amerex for example) you may already be happy at 1/4 the price

I own one and love it. I haven't compared it to any of the players you list, but in my system in easily outperformed a Cary 303/200, and a Copland 289. It is incredibly organic and lifelike in it's sound, with first class imaging, a really refined and warm sound. It's a great value at it's $4K retail price but at used prices the value is off the charts. I've though about a new player once or twice but I can't really think of anything that might outperform it for less than say $5K used. Check out the rave review in HiFi+ for more info and impressions. Happy listening and good luck!