Bold Seagull
strong and stable with me, or...
Having though about this a little my vote goes to Pink Floyd's contribution up until Wish You Were Here. They were more ground breaking than the Beatles during that period imo and I get more from those albums these days than I do from any of the Beatles albums. I can happily listen to all of them all the way through, I tend to get a bit bored with the Beatles after less than an album nowadays.
Atom Heart Mother
Meddle
Dark Side of the Moon - arguably the greatest album ever
Wish You Were Here
Not a big fan of anything from the Wall onwards though.
Can't disagree other than The Final Cut has grown into one of my favourites. With the back drop of the band in meltdown, it is just a frighteningly personal and moving piece of work exploring the very nature of loss and the effects of war. Roger Waters exploration of losing his Dad in WWII as a child is laid bare, and it's amazing piece of work for that.