Everything from your list starting with 1e and ending with 4e pre-Essentials.
1e, Moldvay, 2e, 3e, 3.5e, and 4e were all bought to be played, not as collector's items.
The other stuff I either got from a friend (German Mentzer), from a bargain bin (German BECMI), or out of curiosity.
Oh, and if the PF crowd convinces you to include Pathfinder: I haven't got this.