So basically what you want is a PDA with an eInk screen. PDAs already offer every item on your list and the current top models are $350-400. All the technology is definitely there, it's just a matter of using a bigger screen with the latest eInk technology.
Maybe we could write to HP and ask them to make an Ipaq 210 with a 9" eInk screen. Heck why not ask I-mate to make the Ultimate 9502 available with an eInk screen. Those would be awesome.
