http://pandigital.net/search.asp?productid=392: (specifications) 7” Digital TFT LCD, 600 x 800 pixels

The 6-inch, 800x600 e-ink readers are now at 150 USD (Borders, Amazon, etc.). Some with SD and Bluetooth included. A bit more for touch screens (Sony?).

So, battery life and readability versus color and Wi-Fi.