Name it what you will, I love the Gospel as Calvin catalogued it. The Gospel as the Apostles taught it. The Gospel as Christ (God the Son) preached it.
Spurgeon (the "Prince of Preachers" in his day) says it way better than I could. This quote made my heart leap for joy, and want to share it with you all. Reformation Day is on Friday, and you better believe I'll be building up to it in cyberspace!! :)
"I have my own private opinion that there is no such thing as preaching Christ and Him crucified, unless we preach what is nowadays called "Calvinism." It is a nickname to call it Calvinism; Calvinism is the gospel, and nothing else. I do not believe we can preach the gospel…unless we preach the sovereignty of God in His dispensation of grace; nor unless we exalt the electing, unchangeable, eternal, immutable, conquering love of Jehovah; nor do I think we can preach the gospel unless we base it upon the special and particular redemption of His elect and chosen people which Christ wrought out upon the Cross; nor can I comprehend a gospel which lets saints fall away after they are called."
~Charles Spurgeon C.H. Spurgeon: The Early Years