Check out my friend Peter Kang if you've got the time. He's a christian, and even leads worship for my home church's youth group on Sundays and leads a small group. However, he doesn't label himself as a "christian" rapper. Regardless, there are definitely strong christian allusions in his lyrics.
www.myspace.com/typemanifest
the song "gift" is a good example of the type of music he loves to write, rap, and produce.
Let me know what you guys think! If you dig it, get his cd!