All of the Roxy Music and Bryan Ferry solo albums were remastered in HDCD and sound fantastic, better than the vinyl. Try "For Your Pleasure".
Joni Mitchell's catalog up through "Mingus" sounds fantastic in HDCD. For demo purposes (not to mention musical delight), try "Don Juan's Reckless Daughter" which features stunning Jaco Pastorius bass sonics.
John Hammond's "Wicked Grin" is a rocking, bluesy collection of Tom Waits songs, produced by Waits. It's HDCD and sounds fantastic.