Michael Hyatt (@michaelhyatt), chairman and CEO of Thomas Nelson Publishers, maintains an active blog and personal social media network. In a recent blog post, he created a spreadsheet and compared 10 popular ereaders. He writes
We have really come a long way since Amazon introduced the first Kindle. Today, there are so many great options. Competition has not only created a viable e-reader and digital publishing market, it has also improved the quality of all the offerings.
In addition to looking at the price and features, I think you should also must answer one preliminary question: Do you want a dedicated e-reader device (like the Kindle, Nook, and Reader) or do you want a multi-function device (like the iPad)? This will at least get you pointed in the right direction.