I bought a PS2 about 6 months ago from a coworker and finally got around to getting it working at a good enough resolution on my monitor. I currently have:
GTA 3
GTA Vice City
Gran Turismo 3
Matrix: Path of Neo
Katamari Damacy
Midnight Club: Street Racing
Any other suggestions? I know off the top of my head I want to get the SSX games, maybe some sports games, and of course the MGS titles that came out on PS2. Anything else?