Spurgeon.

Foxe's Book of Martyrs.

Treasure Principle, Alcorn (probably should read Money, Possessions and Eternity, but I haven't yet).

Here I Stand (Luther biography). I'd do this one so we can see how we got all these Protestants, and what divided us from them.

According to Plan, Goldsworthy

A Call to Spiritual Reformation, Carson

The Pilgrim's Progress, Bunyan

Thoughts for Young Men, JC Ryle

Overcoming Sin and Temptation, Owen (I haven't even gotten CLOSE to reading this as I ought, but it is so packed that if you read the first CHAPTER, you will benefit immensly).

The Doctrine of Repentance, Watson.

A Bruised Reed, Sibbes.

The Holiness of God, Sproul.

That's my list off the top of my head, trying to bring in various important doctrines of the Christian faith that we all need to know.

Godly Man's Picture, Watson
Holiness, Ryle
Letters from a Nut, Ted L. Nancy

J

1. Bible
2. I Don't Have Enough Faith to be an Atheist
3. Narnia Chronicles (esp. read to kids)

"God's words", Jim Packer.

R C Sproul, Sinclair Ferguson

O Palmer Robinson, "The Final Word"