I'm sorry if there were in threads like this in the past, but I didn't see any recently.
PSP GO VS PSP 3000
My opinion: The PSP Go looks really cool, the system boots faster and starts the game faster. The design is amazing. But since the screen is the same size as an iphone, you might have to cramp your hands to play. Also, the fact that you have to download every game rather than buying a UMD is annoying.
The PSP 3000 doesn't look as cool as the Go, but the screen is a lot larger, the PSP is alot larger it self so your hands have more space. The battery lasts more than the Go. Also, you can insert the UMDs AND download them from the PS Store.
But the bad thing about all PSP's are that since it only has 1 anolog stick, shooter suck on PSP.