It may sound surprising but I still don't have 'all' of his CD's .
I have all of his albums on vinyl (including the redundant US best of's and a 'Pickwaick' best of and oneimort Best of from Germany + Early Lightfoot and "Sit Down Young Stranger'"titled). Gord's Gold II as well.
On CD :
The UA Collection (To save time in buying all four separately.)
IYCRMM,
Summer Side Of Life
Don Quixote
Old D's Rec.'s
Sundown
Gord's Gold
COTS
Summertime Dream
Endless Wire,
Dream Street Rose
Shadows
East Of Midnight
Waiting For You
A Painter Passing Through
and Harmony.