Considering the lists already posted I would guess that most users (not all) are somewhat younger than me, far too many fighting games!
From the games I actually played BITD my ideal room would consist of (in no particular order):
Pac-Land FireFox Star Wars Gauntlet Ghosts'n Goblins Star Force Scramble Galaxy Wars OutRun OutRun 2 SP Sega Rally Championship Pole Position Gyruss Commando Super Sprint Ridge Racer Super Hang-On Turbo Track & Field Space Invaders 1942 Stunt Cycle Sinistar Buck Rogers: Planet of Zoom Galaga