There was a thread just a week or two on this that I'll bet can be found and you might find helpful.
I bought a Nook with 3G and WiFi a year ago and loved it. My DH got a NookColor for me for Christmas and I LOVE iT. The NC is touch screen and backlit so you can read in the dark. Other Nooks and the Kindle have to have a light source. My sister is borrowing my first Nook and she can read all of the books I have on it and any I add and vice versa, because I kept both Nooks on one acct. One account can have,I believe, 6 devices on it such as multiple ereaders, PC, I phone or I pad. I do most of my reading in bed at night it is perfect for that. And the download is free on the devices. Most importantly, if I have questions or problems I can go to a Barnes and Noble and talk to a human face-to-face. Our local B&N has a weekly forum/class for Nook users.