Vote for every book you're enjoying currently! You can vote for more than one book! Vote for them all, if you want!!
I noticed on some other polls that people always want to say what they're second and third favorite books are, so it seems like most X-fans here are usually reading and enjoying more than one book; this seemed like a better way to see what people really think the best current titles are, without having to limit your choices to just one book (though, I have limited it to just X-men books).