Well.. I'm going to have to cheat and do 12 in total, sorry..
(but there is method in my madness.. why these are important/meaningful personally in each case in parenthesis)
Personal Top 10:
AFZ5-186: BLOOMFIELD, KOOPER, STILLS - SUPERSESSION (Previously Unreleased/Cancelled Sony 5.1),
AFZ5-195: BS&T - CHILD IS THE FATHER TO MAN (Previously Unreleased/Cancelled Sony 5.1),
AFZ5-196: LABELLE - NIGHTBIRDS (Cancelled Sony SACD of this Quad classic),
AFZ5-197: BREAD - BEST OF (One of the best Quad Hits compilations imho),
AFZ5-206: THE DOORS - BEST OF THE DOORS (Ditto),
AFZ5-215: SLY & THE FAMILY STONE - GREATEST HITS (Legendary Quad, mostly with good reason),
AFZ5-234: BILLY COBHAM - SPECTRUM (Previously Unreleased/Cancelled Warner Quad),
AFZ5-236: EARTH WIND AND FIRE - HEAD TO THE SKY (One of Columbia's most immersive Soul/R&B Quads),
AFZ5-237: LAURA NYRO - ELI AND THE THIRTEENTH CONFESSION (Previously Unreleased Quad),
AFZ5-243: LOGGINS & MESSINA - FULL SAIL (One of Columbia's best, textbook mix from their main man Larry Keyes)
Honourable mention for two reissues of essential 5.1 DVD-A's:
AFZ5-203: GROVER WASHINGTON - WINELIGHT
AFZ5-204: AMERICA - HOMECOMING
The two 5.1's above, Scheiner's on fire with easy listening and AOR.. he takes material that's pedestrian in places to a whole other level. AFZ5-203 & AFZ5-204 are unmissable, imho.