Buy these:
- Silent Hill Origins,
- GTA Liberty city and Vice City stories.
- Final Fantasy 1 and 2,
- Star Ocean First Departure
- Littlebigplanet psp.

Daxter (not Jak and Daxter), Ape Escape On The Loose, Twisted Metal Head On, Megaman Maverick Hunter X, Kingdom Hearts Birth By Sleep

this is my PSP Collection, it's not updated I bought a lot of games last year on sales...

http://www.matthewcollector.blogspot.com.br/2012/12/my-psp-collection.html

But I think this 5 games I said are the ones I spent the most time with...

Monster Hunter Freedom Unite, because it lasts maybe around 300 hours of difficult/epic/intense Giant Monster hunting... for the most part. its overall a very fun and deep game, and my personal Favorite PSP game.

Castlevania: The Dracula X Chronicles, because not only is it a great game in itself with a great soundtrack, it also comes with the greatest PS1 game of all time (imo) Castlevania Symphony of the Night.

Pursuit Force is one of my favourites and I think it wasn't mentioned here. Never played the secons part though. It's still not on the PS Store and I only have a PSP Go. :

None of them really.

Just get MGSPW (best thing to come from PSP) in the HD collection

The ps2 version is much better though, so he should get that "if possible :P"

Blast Off - the most fun I've had with my PSP, and it was only 3$.

In what way is the PS2 better?  I can get either one, but if I got the PS2 one I might have to get another memory card, all the ones I have atm are full and I've already deleted everything worthless from them.

FF, Star Ocean, KH, Aedis Eclipse.

CGS is amazing loved it except for how it ended...Seemed very rushed at the end.