hey i havent been here every since my psp got bricked then stolen so i wanna know a few things. one-whats the latest firmware? two-should i get a SLIM or FAT psp? three-whats the latest downgradable firmware and do i need a UMD like lumines? four-if i get a SLIM psp will it be able to use ISOs from FAT psps, for instance if i wanna play initial D street stage, can i use the ISO? five-anything bad about buying a SLIM psp?