Peter Kreeft Theology collection.
He's probably my most favorite Christian writer/philosopher of the current century. If you don't know much about him, I invite you to listen to one of his lectures. He writes in a very similar style to how he talks and teaches. He has a way of conveying information that keeps you engaged and entertained even when the subject matter is utterly serious. And he happens to be extremely intelligent as well.
Yes he's Catholic and if you're among those who are sensitive to this, please take courage and do not make that deter you from discovering his rich writings. There's a lot of common-place Christianity there much like C.S. Lewis; one of his most favorite Christian figures (the others are probably Chesterton and Sts Augustine and Aquinas).
You probably already own one of his works: he co-authored the Handbook of Christian Apologetics logosres:hca;art=title. He also contributed to one of Geisler's apologetic books.
To get another taste of his style of writing, check out a story he made up where C.S. Lewis during his writing of "Mere Christianity" was surprised by Martin Luther and Thomas Aquinas debating. There is a snippet of it here and also in this forum post. And if you search hard enough on the internet, you can find the entire story.
Still not convinced? Why not check out the sample pages and let me know what you think.