As mentioned by micromass, Hrbacek and Jech is about as good as you get. However, I've found that the book is very pricey. There are alternatives. Consider Stoll's Set Theory and Logic. It's excellent. Some of the chapters focus on formal logic, algebra, or the construction of the number line, but he does it in a way that keeps Set Theory front and center. I personally think Stoll's book is a better introduction to the subject, but there's no doubt that Hrbacek and Jech's book is the gold standard. I've heard people really enjoyed Halmos' Naive Set Theory, but in my opinion, it's good for a beginner, but too skimpy for much else.
I'd figure out what you know already, and where you want to go with Set Theory. Each text assumes something different from the reader, and this is important. Then, once you figure out where you are mathematically, choose a book. Good luck. I've found Set Theory to be one of the more rewarding subjects I have studied/am studying.
