[Dave, Melbourne,Australia]

Thanks for starting this excellent thread, JJ.
I think we can take it as a "given" that such an album would include Wreck, Sundown, IYCRMM, Carefree Highway, Early Morning Rain and Canadian Railroad Trilogy.
If it were a 12-track album and the available songs are as you listed, I would vote for the other 6 songs to be Shadows, Restless, If Children Had Wings, Clouds Of Loneliness, Ring Them Bells and Harmony.