I jumped to the dark side I'm afraid and bought myself a Nintendo Ds. I've had it for a couple of years, I was pretty happy with it for a while. In retrospect I think I made the wrong decision though. There are nowhere enough quality games to play, and the stilus just seems to be a gimmick in many games.
The PSPs do offer good graphics I must admit(and plays DVDs), but from what I've heard, their game selection is slowly diminishing.