Hugh Hewitt started this thread on his blog and S.T. Karnick's The Weekly Standard has their holiday book issue out, so I'm ready to weigh in with a few recommendations.
The Brothers Karamazov by Fyodor Dostoevsky
Lancelot by Walker Percy
Love in the Ruins by Walker Percy
Hitler’s Niece by Ron Hansen
The Man Who Was Thursday by G.K. Chesterton
This is not necessarily a top five, but it shows what I’ve enjoyed and what comes to mind easily. As you can see, I REALLY like Walker Percy. If you were to speak to a big group of thoughtful, young, male Christian conservative types, you'd find that they're walking around with a copy of Walker Percy novel in their back pockets as opposed to Catcher in the Rye.