Lets see:
Slayer:
SNM,
HTC and Live undead on 1 cd,
HA,RIB,SOH, SITA, DI,
DIM (2 CD's, 2nd cd has live stuff with bostaph),
UA, GHUA
...plus: Live Intrusion (3 track audio cd, includes venom cover 'witching hour'), Decade of Aggression (2 cds, live), God hates with full force (live), War at the Warfield (dvd), 20 year Box Set (3 audio cds, 1 dvd) and Post Mortem: The tribute to slayer (2 cds).
Dunno what should be considered as 1... but thats the full list of slayer.
after that:
5 Emperor Albums plus live ceremony on audio cd and dvd, scattered ashes.
5 Burzum albums and A tribute to Burzum cd
6 Immortal cds (still dont have damned in black)