#22 - I love John Piper.
No really. I mean, I wish the man had unmarried sons so that I could have him as a father-in-law! Seriously, though, I love his depth of insight, his perspective, and his heart. He finds a way to bring glory to God in every aspect of life, and his theological insights are dumbfounding. If you've never read any of his books or blogs, you definitely should. They are slow reads because each sentence basically knocks you over with its theological implications, but it's well worth it.
You can get all of his sermons and a lot of his writings for free at www.desiringgod.com.