which is better PSP 2000 or 3000?

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I want to buy a PSP i didn't know what is the difference between them, which is the latest?, how much it is in the phil.? What is that version 5,4, wat ever? I have no idea about PSP. Somebody will help me regarding this! to those who are know about PSP update, do you have a website you can offer to me so I can surf it. Tanx to those who response.