Original PSP for $80, worth it?

My friend has an original PSP that he's looking to get rid of. I think it comes with a 2gig flash card, and a new battery.

I hear that there aren't a lot of quality games for the system. I'd be getting Crisis Core, maybe Metal Gear and Patapon. FF Tactics is also a possibility.

He's looking to offload it for $80, and I just got some birthday money. Worth the purchase?

Disgaea: Afternoon of Darkness (still playing it to get at least 5 of the 6 endings). I could play that game over and over. (currently on 2nd play @ 200+ hours)

Metal Gear portable ops

FF Crisis Core

Top three most played.