With a PC like that, why dont you just play PC games?!
Because most of the best games ever created were made on the PS2 and can't be found others. Unfortunately, only some of them have been ported to more recent consoles, and even few - if any to PC.
Ico*, Shadow of the Colossus*, Persona 3-4, Devil Summoner(Pretty much all Shin Megami games for that matter...), Timesplitters, FF series*, Indigo Prophecy*, MGS*, Okami*, Valkyrie Profile, Mark of Kri, God of War*, King’s Field, and many, many mores. That's not even counting PS1 games. For the sake of time I won't go there though.
I would wager there are more critically acclaimed PS2 games then PC games.
Gameplay/Story > Graphics
Not to mention, with a system like his he could easily drop the program and the entire ISO into a RAMdisc and force a ton of eye-candy to make it look better than it did originally. Hooking a PS3/x360 controller is a piece of cake too(or even just a regular PC controller). Better graphics, more fluid gameplay, and an easier method of saving make past favorites far more enjoyable than they were before. And if you haven't played them before than even better.