ace combat 4 is awesome, but short. have you tried sky odyssey?
http://www.gamefaqs.com/console/ps2/
this should help with your questions.
try max payne, if it doesn't make you too queasy.
baldurs gate: dark aliance is good.
socom navy seals isn't bad for one player, and the microphone really immerses you in the game.
mark of kri is a really cool adventure / brawler.
splinter cell lets you sit still if you get queasy, and the lighting effects are incredible. truly the next level of gaming.
Maybe thunderstrike as well.
http://www.gamespot.com/ps2/action/t...ix/review.html