Surly 1x1 or Karate Monkey, Santa Cruz Chameleon, Redline Monocog, Kona Explosif, Kona Unit, On-One Inbred, Salsa El Mariachi.
Those aren't that old, but mtb standards move fast, so not sure how far you wanna go back.
I've owned a ton and am currently building up another: 2015 Salsa El Mariachi. Shorts stays with swing arm dropouts, 29er, rigid, lots of rubber.