Ah, I usually end up with a huge handheld library because I like them (although I prefer consoles) but my Jak is a handheld woman. She's got over 100 GBA games (just GBA) across 3 regions so I get to experience pretty much every aspect of every handheld gen, so I'm alil jaded on the subject.
As it stands I'm putting money awat for NGP and getting whatever PSP games I need to get out of the way. Fun Fact, as much as I love the PSP, its actually possible to own pretty much every game I really want, whereas with DS I don't think I'll ever own all the games I'm really lusting after.