Hmmm... I likey the SD card slot. But for the best in audio playback the Wolfson Audio DAC might be worth the $100 dollar extra price of admission on the Pioneer BDP-51FD (the non-Elite model).

In my opinion anyway.

My Stuff :

M80's
QS8's
VP150
EP800
Denon 4802
Emotiva XPA-3
Samsung BD-P3600
Sharp 65 Inch Aquos LCD