I, personally, strongly dislike the chrome strip on the 60GB version.I'd wait for the 60. It's not that the 20GB is a rip-off (like Xbox 360 Core), but if your paying over $500 for any console, why not spend $100 more and get the best? The 60GB offers Wi-Fi with the PSP right out of the box, and it looks aesthetically more pleasing than a 20GB with all those attachments (USB Wi-Fi adaptor, USB memory card slots) sticking out of it.
I can answer this one - USB key. Saves easily copy to & from a usb key, or memory stick.