umm, my experience with PSX came mostly with emulators and i never forget the evening when CVGS worked with Tenchu 2 ... i never forget that evening.
my essentials:
Tenchu 2
FF 9
Tekken 3
Tony hawk pro skater 2,3 and its equivalent BMX game
Spider man (donno which version it was, it was GREAT and swinging ...)
Jackie Chan (great platformer)
of course, Resident Evils: 1,2,3
Dino Crisis 2
Nightmare Creatures II
Vagrant Story
FF VIII (i finished its PC version, so cool)
Parasite Eve 2
MGS1 (finished it on PC, great game for PSX)
Driver (same as above)
Tomb Raider 1 (above)
Fear Effect 1,2
Oddworld 2: Abe's Exoddus (above)
i'll add more.