Off the top of my head...
Flat as a Pancake - Head East
Leftoverature - Kansas
Boston - Boston
Foriegner - Foriegner
Grand Illusion - Styx
Equinox - Styx
Just a Game - Triumph
Infinity - Journey
Evolution - Journey
Captured - Journey
Next 10
Rumours - Fleetwood Mac
Stranger in Town - Bob Seger
IV - Led Zepplin
Van Halen - Van Halen
Dark Side of the Moon - Pink Floyd (until classic rock radio ruined it by over playing)
Goodbye Yellow Brick Road - Elton John
Toys in the Attic - Aerosmith
Breakfast in America - Supertramp
One for/from the Road - Lynyrd Skynrd
Tea for the Tillerman - Cat Stevens
No way I could rank these 1-20.
I'd like to see a thread like this for releases after 2000.