Liberty Fund has put together the best edition of John Milton's political works. It has a good binding, fine-looking text, and includes several selections not included in the Cambridge edition, most notably "Areopagitica." While Milton is best known for his epic poetry, he was also an insightful commentator on politics and religious issues, especially religious toleration. As a sincerely religious defender of toleration, he (along with others such as the Baptists, Roger Williams, William Penn, and John Locke) helped bring about religious freedom in the western world. Reading Milton is essential for a full understanding of English political theory. Having said all this, he is not an easy read for non-scholars, not least because of his strange 17th Century English, so expect an intellectual challenge.