I've grown to really like my Nook Color. Buying books on B&N is easy, there's a ton of them, and they look good on the Nook. I read a lot at night after my wife has gone to sleep, and the glare off of the tablet isn't enough to bother her, so that works out well for me.
The really good thing, and I'm sure you get this on a Kindle too, is that I downloaded the Nook app on my Evo, and I just kind of go back and forth with my books from my phone to my Nook during the course of the day.