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There's no physical difference, the number at the end is the PSP's region which will affect what movie UMDs you can play, and some online features such as the PSN. PSP-2000 is the Japanese regional variant, PSP-2001 is the North American.
Yes a newsoftware that has come out psp version 6.10 for the new psp go! Now available on psp slim with new features like senseMe, a new way to enjoy your favorite music even now you can update it i already did!
Psp street is much better i have psp 3000 and psp street and psp street is better then psp i would say.
The only alleged advantage is that it's cheaper, but not only is it way more expensive than any second hand version of other PSP models, it's barely much cheaper than a retail PSP-3000, and it lacks so many features that it's not really worth it in the first place.
PSP-1000, PSP-2000, PSP-3000, PSP-N1000. Thus, there are four versions of Sony PSP.