I've been pleased with the iPad for PDF. There have been a few files that have displayed wonky in one app, but not another. At this point, I've got 3 apps that can handle PDF on the iPad, and one or more can display just about anything I've thrown at it.
And the Kindle app will also allow you to Whispersync with the K3 with the Kindle app. I've been syncing between my iPad and iPhone and have found it to be a nice feature, especially since the iPad isn't really all that portable away from home. I just wish I could side-load to the Kindle app via WiFi rather than mucking around in the iMess, as I prefer the Kindle app over iBooks and Stanza.
It's a bit more expensive than a DX, but you get additional capabilities. If I wasn't such a heavy library user, I'd already own a Kindle 3 and iPad. I've been thinking about getting one anyway!
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