You came back (Mr. USA Today
I upgraded from K1 to K2. I still own both but K2 is now my main reader and K1 is my back-up (I'll never give it up
I don't miss the removable battery or SD Card storage (maybe a little). K2 seems to be a bit more "hackable" for additional features. It's pretty much the same interface with some nice tweaks, with a joystick for navigation. You'll feel right at home with a K2.
I did not pre-order a nook and have no plans to purchase one, though that should change (I think I'd like the Alex better). I would much rather hear from people who actually get a nook in their hands than jump on the band wagon right now. I'm holding out for the Plastic Logic Que (I'll be waiting for hands on reviews before I purchase).
You should buy something right now thereby guaranteeing that a new version of the device will be out in a few months for the rest of us who are waiting.