Thanks so much, everyone. I think I will go out later and view both readers in the flesh, as it were. Its a little disappointing about losing syncing of bookmarks etc, but perhaps that doesn't matter so much if I end up reading only on one device (eg not between ipad and either of these).
I do use Calibre, so would convert that way. I've done it before with a few books, so an overnight conversion of 2000 is of little consequence. Not even sure I want to carry a year's worth of books, I only ever have 40-50 on my Sony, I'm a slow reader, so many things to distract me, so getting through them all in a year is unlikely. LOL at your 100 books a day, eschwartz