I play original (1974) and Advanced (1978) Dungeons & Dragons - the ones that Gary Gygax wrote. I've got stacks upon stacks of books for AD&D (some of them autographed by the Man himself, may he rest peacefully), many duplicates, and copies many times over of the OD&D booklets (also one set of those autographed).
2nd Edition was a wimpy neutering of the guts-n-gore of the predecessors and characters in 3, 3.5 and 4 might as well wear blue tights, a red cape and sport an "S" on their chests.
Big RPG fan here. As my name implies, "my game" was always Runequest, but we play Rolemaster, AD&D (and I agree that the original AD&D is the way to go), Traveller and plenty of others.
Big fan of the original Warzone and Warhammer 40K Rogue Trader mini's games too.