The only unit that even comes close is the PhatNoise. I believe Kenwood has a contract to make them. They look like a unit that has pretty high quality, but it's more of a 'user' level audio component. If you want to play with your player, you're going to need to find one on E-bay.
They CAN still be found for 500-600 for a 20 GB unit. (don't forget that you need an amp ~200 for a high quality unit) and a tuner (300 for an xm satelite reciever)