Which mobo your 2000 have? and its current firmware?
http://www.epforums.org/showthread.p...-and-additions!
http://www.epforums.org/showthread.p...ed-few-updates!
I'm quite unsure whether you can access PSN or not(haven't tried it myself, yet), and there have been reports where some users got banned when trying to access PSN through CFW(since 6.60 release), while some aren't.
But just to be on the safe side, and if you decide to use either PRO or ME on 6.60 firmware, you can always dualboot(from OFW to CFW, vice-versa) everytime you want to access PSN, or run homebrew/game.