I have an Irex DR1000 that I got specifically for reading PDFs. I like the fact that I can see most PDFs in full size.
I was planning on using it for PDFs and my Iliad for other books, but I'm using it for everything. I'm a reasonably fast reader and I like the fact that there's more text per page than with the Iliad.
My $.02US anyway.
I hope this helps.