It is not possible for me to vote until I know more. I am happy reading on my PDAs and am not willing to erase my eReader and .LIT DRM ebooks (yet). An ebook reader is also one more device to carry around. The only thing I can vote on this early is which company I am unlikely to buy from.
So, the reader should be cheap (face it, a better one will soon come out), use CF or SD card instead of internal memory, support a DOS-compatible filesystem so books can be copied to the card in a cardreader, have an acceptable DRM (as I would have to buy some books), support PDF so I can read my tech literature on it, have a reasonable size and be light. Yes, I know, I am in for a l-o-n-g wait but so be it.
The ideal reader is probably a foldable eInk paper connected to a small box you have in your pocket.