1. If PDF is highly important to you, get the Kindle DX if you're okay with the PDF limitations (you can READ them but pretty much do nothing else with them). If you're looking for the "perfect" PDF reader, then Kindle DX isn't it and you might as well save your money and get the Kindle 2 until a better PDF reader comes along.
2. If a big screen is highly important to you, then get the Kindle DX if you don't care about it being a bit large to carry around with you all the time.
3. Otherwise, get the Kindle 2; it's cheaper, does almost everything the Kindle DX does, and has easier to use keyboard and buttons.
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