Amazon! Books!

I got a gift certificate to Amazon.com for my birthday!

I'm very excited about it... the only thing is - I have no idea what to buy! Amazon has everything.
I'm pretty set on books though. I love LOVE to read. Books always make me happy. While I've met books I don't particularly like (hello, textbooks) I haven't met one I absolutely hated.

So ... any suggestions on what I should buy? I love fiction - particularly historical fiction (think Alison Weir or Philippa Gregory). I love to read about law, French history, English history, and Early American history.

But! I'm open to other books too - especially murder mysteries and classics.