New PSP Slim owner, now what should I get?

[LynxFX]

Finally decided to pick up a PSP. I got the Daxter bundle. Pretty sweet little system but now I need to pick up some excessories and perhaps some games. One of the disadvantages right now is that all the cases and addons are meant for the original PSP. I need to find a case that will work well with the new one. I'm also looking for a good speaker setup that someone could recommend.

Also are there any other little gadgets that I should consider picking up? I'm mostly going to be using it as a video and audio player and using remoteplay, perhaps get locationfree soon as well.

Finally, what are the must have games?

Thanks guys! I'm definitely digging it so far.