The open question on all of these tantalizing new e-book readers for me is "availability". The only two commercially available readers in the US are the Sony Reader and the Kindle. I don't count the Cybook, as there is only one commercial site, BooksOnBoard, and it's only available there as a bundle.
I want to walk into a retail electronics store and actually play around with 2 or 3 devices before making a purchase decision. By that criterion the only choice is the Sony Reader.