so i'm tired of my DSi XL's build quality being far superior to that of my shitty PSP2000 (the plastic housing is weak/squeaky, scratches/chips all over, buttons are mushy, and screen looks like shit with dead pixels all over it). i'm getting a 'go' tomorrow, and i can't find anything on the date codes. what do i need to check for on the box to know it has 6.35 or lower? how old does it have to be to still come with 6.35? what are the chances of Gos coming with 6.37+?