hey i had a psp at launch and it was defective =Z so i returned it and went to ds

i want to come back to psp again yay hhaahahh

should i buy a psp used or brand new?

i know a few psp's for sale used

should i buy a version 2.71 psp and downgrade it to v1.5?

or should i buy a v1.5 psp and keep it that way

my friend has a psp v2.81 he's selling for $160 because he already has a psp
but you cant downgrade that right?

should i buy that and upgrade to v3.02 OE firmware ? i heard it can run homebrew as well

i dont know which psp to get haha, can someone explain each firmware, (ex. pro's and con's) are there any restrictions or limitations?