A word of caution. The white Novel is not the same as the black. The hardware and software are quite different. The white runs Android 2.0+ as opposed to the black which is 1.5. Overall, the white version appears to be a much better device. At least alternative reader software is available.
At under $100 either is a bargain (we don't see deals like that here.) At the regular price ($150) the value is marginal.
Based on my experience yesterday, the screen is almost legible in sunlight but usable in open shade.