As short as it was, this thread could be used as a starting point: http://dollars-bbs.org/games/res/1297164255.html
Maybe a bit of information on what kind of games you enjoy would help us make suggestions, but I would personally go with P3P, Phantom Brave, Tactics Ogre, Valkyria Chronicals 2, Disgaea 1 and 2, and anything produced by Atlus or Gust that makes it's way to the PSP. Final Fantasy Disidia seems fun too, but that wasn't really my thing. Mind you, my experience comes from borrowing my friend's PSP, so there are plenty of other great games out there that I haven't heard about.
>>9 I have 200 and 20 something hours:D but I want FFType 0 to come out already!! AHHG! And FFVIICrisis core is good, zack is awemazing :3 >>7 I agree, I love Square Enix XD