I don't really have a definite Top 10, but here are all the albums I would give a six star honorable mention to. No order, except the bolded which is my favorite album ever.
Arcade Fire - Funeral (2004)
Atheist - Unquestionable Presence (1991)
The Beach Boys - Pet Sounds (1966)
Death - The Sound of Perseverance (1998)
Meshuggah - Chaosphere (1998)
Wolfgang Amadeus Mozart - Requiem (BBC Symphony Orchestra/Colin Davis) (1967)
Opeth - Blackwater Park (2001)
The Smiths - The Queen Is Dead (1986)
Soundgarden - Superunknown (1994)
Suffocation - Effigy of the Forgotten (1991)
Temple of the Dog - Temple of the Dog (1991)
Yes - Close to the Edge (1972)