Hey Bex, you should check this out. This is the one I use:
Amazon.com: PSP Slim Crystal Hard Case for PSP...It's really sturdy, and keeps the slim exactly that...slim. The super sick thing about it is you can also use it while using custom
PSP skins. If you have a phatty then yea, you're waaaay better off with the PGP. I'm gonna rig mine to use it with my slim. But for the price, and ability to play without removing it from it's case, it's worth it. The only time I gotta remove my
psp from the crystal hard case is when I gotta remove the battery.