Easy to find good sounding used LPs 70s/80s.....

Great start here are a few more:

Steely Dan-Aja (need this in addition to Gaucho)
Fleetwood Mac-self titled-again gotta have
Heart-Dreamboat Annie
Boz Scaggs-Silk Degrees
Doors-Best of
Cream-Live at Royal Albert Hall
Dire Straits-Brothers in Arms
Lynyrd Skynyrd-Gold and Platinum
Toto-IV
Foreigner-Self Titled and IV
Cars-Heartbeat City
ELO-Out of the Blue and OLE ELO
BTO-Not Fragile
Doobies-What Were Once Vices are Now Habits
J. Geils Band-Freeze Frame
Bob Seger-Nine Tonight
Bad Company-Straight Shooter
38 Special-Flashback
Huey Lewis and the New-Sports
Cheap Trick-Dream Police
Clapton-Behind the Sun
Kansas-Point of No Return
Tom Petty-Damn the Torpedos
Pink Floyd-The Wall

All of the FREE (with Paul Kossoff and Rodgers) studio albums.

Supertramp - Crime of the century

Pretty Things - Parachute

King Crimson - In the wake of poseidon

Gentle Giant - In a glass house

ELP - same (1970)

UK original presses of these sounds best, no doubt!

Little Feat - Dixie Chicken, Waiting for Columbus
The Band - Rock of Ages, Northern Lights Southern Cross, The Last Waltz
Steely Dan - Katy Lied
Bob Dylan - Blood On the Tracks, Oh Mercy
Joni Mitchell - all of hers
Bonnie Raitt - Green Light
Maria Muldaur - Waitress in a Donut Shop
Weather Report - Heavy Weather

Hard to believe THE REQUIRED ALBUM for ANY AND ALL vinyl lovers isn't listed:

Pink Floyd - Dark Side of the Moon