New Orders's Substance is a great LP. I have that in my collection as well. It has the '83 version of Blue Monday, the original, which is much different than the '88 Quincy Jones version. Not to mention the different remixes on the '88 single. I paid used single price of $3 so it was a bargain.
I didn't post this before since I needed to take some time to look at what I have, but yet very far from a complete list...
Some of my most interesting records are Dangerhouse Records Yes L.A. clear with green and pink silkscreen, an autographed copy of Napalm Death's Harmony Corruption, Septic Death's Kichigai. I also have some nice bootleg vinyl of Misfits Return of the Fly EP, GISM, Confuse, Mob 47, Zouo, SoB... etc. lots of Japanese and Swedish punk/hardcore from the 80's. I have some obscure pressing of some more common records like Ramones Leave Home, but from CFRJ (Yugoslavia), Dead Kennedys In God We Trust from France. I have a bunch of unimpressive 80's records like Duran Duran, Gary Numan, Madonna, Stacey-Q, Michael Jackson, Real Life and Kraftwerk. Most recent stuff from the likes of Scissor Sisters and Mark Ronson. The rest is more common 80's punk/hardcore and black metal from the late 90's like Mayhem, Dark Funeral, Emperor, Anti-Nowhere League, Black Flag and X. I also have a few random disco records Like Stargard, Michael Zager, Bee-Gees, Donna Summer and of course Giorgio Moroder.