Bookworm_Girl, well have I got the topic for you! Heh, just kidding, but it's wild that you posted that as I was writing the rest of this post (I only saw your post just before I posted), since as you'll see we were definitely on the same wavelength:
All right, I'm going to cart out and nominate an old topic that I'd even suggested we leave be because of its complexity: Journey around the World.
The reason for this about-face for this month is simple-
Dazrin's stats.
He has kindly done all the legwork of listing all the countries we've read books from over our history, which work was what made the category complex.
Also, Region was always a popular category and this one is along the same line but easier because no pre-vote.