There are only two eReaders - Sony and ILiad - which feel like a book and their display is close to paper book. Reading books off tablet pcs or PDAs in not very realistic. I tried it and have given it up and the experience does not come anywhere close to reading it on Sony eReader. However Sony has some of its own issues like I found its page Refresh to be very irritating.
If you are not into PDfs then Sony sounds like a good choice for you and is not botehred by its page refresh.
There is no color eInk based Reader available nor any that comes with backlit. However putting a clip on over Sony is very starighforward and you can take a very small USB based one and it works better than on a Paperback since page turning with Sony reader is a breeze and the Booklight does not come in the way.