I have a PSP 2000... I'm thinking about getting a 3000 model or go... or, waiting for a possible (?) 4000 model. I only play megaman powered up and tekken 5 on my psp, and powered up gets more attention at the moment then Tekken 5. I usually switch every once in a while... I have 6 psp games, but, those two really raised my expectations in portable gaming.
My psp rarely died on me, and almost never dies on me while I'm playing a game. My psp is set to turn off after 5 minutes of inactivity. Think about it, how often will you go 6 hours with a charger, or, will you be using your PSP for so long? Get a car charger if you need. I keep my screen on the lowest brightness setting. It's also a good idea to keep the sound down too. It can last up to 12 hours if you're not doing anything but listening to music, just make sure you shut the screen off. Mine's set to turn off after 2 minutes of inactivity.
For some unknown reason, my psp always turns off on me when I'm asleep, all the time. No idea how it does that, but, when i go to sleep, I wake up and the thing's off. It never turns off on me when I'm awake.... I can leave it in my pocket for 4 hours and it will still be playing.... But, I don't think my PSP will last any more than another 2 1/2 years tops, it's had a ton of useage.