How much do kindles or nooks run? and are they worth it?

I used to hate the idea of a kindle or nook because I like the feel of paper books and it feels less artificial. I'm getting like 700 dollars from my mom and grandparents for graduating and am debating on either buying a 3DS or a kindle/nook. I do like handheld gaming, but I love to read more. Do you think it is worth it? Or if I do like paper books more should I just stick with them?