Rich, I might change my arbitrary cut-off for collecting posters at some point in the future, as I do see some really good modern stuff every once in a while. For now, the most recent poster I have (Nightmare on Elm Street OS) is from 1984, but who knows where things will be for me 10 years from now?
Jeff, I bought the Revenge of the Creature 6-sheet already linen backed. Personally I wouldn't have done it, because the poster was in pretty nice condition to begin with, and I much prefer unbacked paper. I have to say though that having it backed on sturdy linen allowed me to hang it on my wall for a while without getting it framed, which was a nice bonus. I eventually had a large painting put in that spot, so the poster is now rolled in a tube in my storage room.