Hey George,
Glad to see the lists are shaping up! Good job!
As for Dead Can Dance - Into The Labyrinth, the decoder would be Sansui Variomatrix on "Surround" setting.
Here are some more, all Variomatrix on "Surround" setting:
Pink Floyd - Piper At The Gates of Dawn
Pink Floyd - Saucerful of Secrets
Pink Floyd - Electric Moo (studio sides)
Jimi Hendrix - Electric Ladyland
Jimi Hendrix - Are You Experienced? (funky soundstage, but great seperation and discreteness)
I've also found that Frank Zappa - Lumpy Gravy sounds great via simulated surround. The surprise here is that I find I get the best effect with my Tate in the SQ mode! This album came out in 1967, years before SQ, so it's interesting that it would sound best in SQ mode. Go figure.