I change my mind about this stuff too often. Don't listen to me.
E-ink is vastly superior to LCD for reading text. Nonetheless, I got sick of traveling with a laptop, a Kindle, and a smartphone. So I bought an iPad and am returning the DX. I might probably get the cheap, WiFi-only Kindle for reading ebooks. But motherfucker, the iPad is better for comics and PDFs. It was also kind of annoying that the DX has no WiFi and thus no free document delivery. Plus, since I can use a bluetooth keyboard with the iPad, I can do real writing on it, which is most of what I usually use a laptop for.
I did read Super Sad True Love Story and Vidal's Washington DC on the Kindle. Those are both very good novels.