I bought a DX today. No idea if it was the right choice. The reason why I finally bought one is because the WSJ wanted to jack up my subscription rate to $440 per year, while the e-rate is $180. The Kindle will pay for itself in no time.
My wife just got an iPad so we already have one in the house and I just got a laptop last year (plus I have an iPhone), so I thought the iPad was overkill at this point. Didn't really see what I would need an iPad for. Everything I read about the book/magazine/newspaper features of the Kindle vs the iPad gave the best grade to the Kindle. I was going to go for the standard Kindle but I thought reading the newspaper on it would be brutal, so I went with the DX.