Which Nook should I get?

I'm really looking into getting a Nook from Barnes and Noble. I know I definitely want a Nook, not a Kindle. I'm having trouble deciding if I should get the old Nook, the Nook color or the all new Nook. I don't read that much even though I like too, I also read mainly chapter books. Does anyone have any problems with their Nooks or any comments on their Nook?