Those "perfect" (non-metal) albums...

I'd have to say...

Aphex Twin - Selected Ambient Works 85-92
Bohren Und Der Club of Gore - Black Earth
Miracle Legion - Drenched
Beck - Odelay
Pink Floyd - DSoTM
Boards of Canada - Music Has the Right to Children
 
- Every album Elvis Costello did with the Attractions
- Men at Work's BUSINESS AS USUAL
- Men at Work's CARGO
- Herbie Hancock's HEADHUNTERS
- Herbie Hancock's MANCHILD
- Kool and the Gang's HOLLYWOOD SWINGIN'
- Oingo Boingo's NOTHING TO FEAR
 
Man I love these kinds of threads!!!!

SOCIAL DISTORTION - White Light White Heat White Trash
LYLE LOVETT - Pontiac
DWIGHT YOAKAM - If There Was A Way
STEVE EARLE - Copperhead Road
NWA - Straight OUtta Compton
JOHNNY CASH - American IV The Man Comes Around
DAVID LEE ROTH - A Lil Ain't Enough
 
JOURNEY - Escape
JOURNEY - Frontiers
RUSH - Moving Pictures
RUSH - 2112
RUSH - A Farewell to Kings
CAB - Cab2
 
Sieges Even - A Sense Of Change

A perfect progressive album, although technical its a very emotional album. Its very clear in composition and production. There are hints to jazz and classical music. Perfect musicianship.
 
Siamese Dream, Mellon Collie and the Infinite Sadness by the Smashing Pumpkins
The Fragile by Nine Inch Nails...but that's kinda metal
 
Current 93 - Thunder Perfect Mind
Current 93 - All the Pretty Little Horses
Porcupine Tree - Voyage 34: The Complete Trip
Paatos - Kallocain
Massive Attack - Mezzanine
The Blue Series Continuum - The Sorcerer Sessions
The Blue Series Continuum - Good and Evil Sessions
DJ Spooky/The Blue Series Continuum - Optometry
King Crimson - Discipline
Kyuss - Welcome to Sky Valley
Bill Hicks - Rants in E-Minor
Pineapple Theif - 137
Sol Invictus - In the Rain
Tenhi - Vare
Ulver - Themes From William Blake's "The Marriage of Heaven & Hell"
Of the Wand and the Moon - Emptiness Emptiness Emptiness
Azam Ali - Portals of Grace
Dead Can Dance - Toward the Within
Robert Rich - Seven Veils
Miles & Coltrane
John Coltrane - The Olatunji Concert: The Last Live Recording
Stone Breath - A Silver Thread to Weave the Seasons
The Mystick Krewe of Clearlight
King Crimson - Larks' Tongues in Aspic
King Crimson - Starless & Bible Black
Kodo - Mondo Head
11,000 Virgins: Chants for the Feast of St. Ursula
Porcupine Tree - The Sky Moves Sideways
Talk Talk - Laughing Stock
Fantomas - Delirium Cordia
Talk Talk - Spirit of Eden
Bohren & Der Club of Gore - Black Earth
Melvins - Hostile Ambient Takeover
Clutch - The Elephant Riders
Porcupine Tree - Stupid Dream
 
Cake - Prolonging the Magic
Men at Work - Business as Usual
Men at Work - Cargo
Elvis Costello - every album with The Attractions
 
Madness- Divine Madness
At the drive-in- Relationship of Command
CKY- Infiltrate. Destroy. Rebuild.