I have a PSP-2000 with that old M33 firmware. I think I'd like to keep it that way. In this modern day of 2014, what do you think is the most compatible, most recommended firmware, and preferable PSP? Should I buy a 3000? Should I buy a GO? Should I just keep 2000 and upgrade? What do you think is best for me? Keep in mind that I'm not trying to pinch pennies, If you think I need a newer or different system, please suggest it, and hopefully suggest the why.