PSP slim is cool but be warn that it might not be able to downgrade too soon due to the Sony is clever enuff not to have any loophole for any hole.
I read that Lumine can downgrade any firmware (till which, im not sure).
As for the upgrading accidentally, best to approach ppl to do it for you since it would'nt cost you too much and you can use lots of games.
Much as I asked before: Gamescore 3.40 OE-1 (Funan) $319 w screen protector./ Queensway $310 (I dun think there's any freebies).
As what I feel, I would think of SLS because I wouldn't know the set itself. IMHO feeling. No against.