Depends, have you played all the RPGs that you wanted to on the PSP? (i.e. would you play Kingdom Hearts: Birth From Sleep) I was considering buying a DS a while ago as well (I, too, own a hacked phat PSP) but decided to wait for the DS's successor. Unless you really want to play the FF4 remake or something, I don't think there are too many (decent) RPGs on the DS.
Upon arriving the attending doctor could find no abnormal physical symptoms other than extremely dilated pupils. After spending several hours terrified that his body had been possessed by a demon, that his next door neighbor was a witch, and that his furniture was threatening him, Dr. Hofmann feared he had become completely insane.