Hi allEars, and welcome to the club.
The Pioneer BDP-51FD Blu-ray player is an excellent choice for your particular situation,
mated with your excellent Marantz SR7500 legacy A/V Receiver.
Get that HD DVD player out of there, and connect that Pioneer Blu-ray player instead.
And I also know the excellent deal (big discount) that this player is selling at.
The Pioneer BDP-51FD uses four discrete Wolfson Stereo Dacs for digital-to-analog conversion and includes a jitter-reduction circuit for premium analog audio playback with CDs and Blu-ray discs with multichannel soundtracks. The excellent Wolfson Dacs are the WF-8740.
It is one of the very best player for sound quality from it's multichannel analog output.
The SNR of the WM-8740 Dac is rated at 117db, and it's THD at 104db, excellent figures.
But the real proof is in the pudding (audio listening).
* Plus, with all the latest firmware updates that this player received, it should be just cooking.
You're good to go and you'll be flying high with all ears.
Cheers,
_______
Bob