Reddit mentions of The Works of Jonathan Edwards, Vol. 2: Volume 2: Religious Affections (The Works of Jonathan Edwards Series)

This is a good list. Quick suggestions...

As others are saying, Athanasius' On the Incarnation is a must-read if you're looking at the great theological works of the tradition. I have the edition from the Popular Patristics series sitting on my shelf. It's a good translation. You can also find it here online.

For Augustine, read his Confessions. It's the first autobiography in the West. That's pretty wild. I read the Oxford edition; that's what I usually see people point to. His City of God is also very important.

For Aquinas, his great work is the Summa. It's massive. And in order to really understand Aquinas, you should understand Aristotle first. Your reading list is getting quite long now—but there are abridgments and reading guides to Aquinas out there if you're interested. Peter Kreeft's Summa of the Summa has often been recommended to me.

John Calvin's Institutes of the Christian Religion should be added. It's hard to overstate the significance of this work. Many would call this the greatest theological work that came out of the Reformation. The Battles edition of the Institutes is more expensive but far more readable than the older Beveridge edition.

Jonathan Edwards is one of the greatest minds in American history. He's certainly not as important as Calvin, but his End for which God Created the World and his Religious Affections are both very good works by, like I said, one of America's greatest minds.

God bless you if you can make it through 14 volumes of Barth's Church Dogmatics. They say Barth's exceedingly important, and I believe them—but frankly I'd put him at a much lower priority than anyone else here. Because Barth stands in the Reformed tradition, I doubt one is able to fully appreciate him without first reading Calvin anyway.

When someone asks about the greatest theological works, some will always recommend works by contemporary writers. Some very good stuff has been written by folks who are still alive; N. T. Wright comes to mind, though I think he's too verbose for his own good. But I'm of the opinion that we don't yet have the historical distance to discern whether works by contemporary authors ought to be placed among the undisputed greats of the tradition.