I have a Nook and love it. I know lots of folks with Kindles who love them. But I will say this - reading patterns on a Nook or Kindle isn't all that easy. You might want to ask friends or family who already have one of these to let you see how it would be to read a pattern off of one.
I can read anything I have on my Nook on my computer as well, so that's how I do it when I want to search through patterns from my online quilt magazines, not my Nook itself.
Good luck!!