Greetings and welcome to the forum. I have the Kindle1 and have worked with friends Kindle2 and the new Aztak 5" ereader, plus I know that many forum members love their Sonys. I don't think you can go wrong with any of them.
The biggest question is where will you be getting your ebooks. If you want to purchase them, then the K2 is probably a good choice as Amazon has good book prices. If you want to get them from a public library, then unless you buy a Sony (or perhaps the Aztak), you will need to convert the book or remove the DRM to be able to read it on your Kindle. I get mostly library books and find this an easy process, however.
I found that it took less than a week before I preferred reading from my Kindle versus paper books, just from the convenience. I travel a great deal so having all my books with me in a tiny little package is heaven.
Let us know what you decide.
cheers
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