I do still recommend the SC3 despite its issues, especially since you're not looking for a portable powerhouse that you want to watch HD videos on during cross-country flights. For your intended usage, I think the SC3 might be the better choice for you because of the larger screen, which is particularly nice for reading ebooks. The device isn't much bigger than the U810 either (as you've seen in the photos), so you're not sacrificing portability for the extra screen size. You also get a bigger keyboard.
Are you interested in the U2010/U820 at all? If so, then you may want to wait for the U820's release in the US before making your final decision, as it's expected to be priced in the same range as the SC3.
Feel free to start a new thread in the UMPC forum about this. I'm sure that other members would love to share their insights and offer their suggestions as well.