Yes I have thought about the bad screen quality of the 700 being bad for my eyes. I saw this YouTube review though a while back that made me think it would be ok. The picture seems very clear, and it was only when I compare the 700 with the 505 that I noticed a degradation. I think the Cybook looks like a good choice. I'm going to wait till this Amazon press release to see how the Kindle 2 fares before I make my final decision.
I'm new and don't really know how the karma system works, but I'll certainly try and give some to all the helpful people in the thread.
edit: Youtube video review:
http://www.youtube.com/watch?v=C5wBUfVsnuU