Steely Dan "Gaucho" was the first I got from HD Tracks and one of the top 5 I own, its the one that really got the ball rolling for me with hi-rez stuff.
Lately, the most recent "wow" from HD Tracks has been Stevie Wonder " Innervisions ". and the Talking Heads stuff..really good they are I can't believe I forgot until now to mention that. Talking Heads Hi-rez stuff is excellent!!!