Derek Webb is probably my favourite Christian artist at the moment. This is a good ,though older, tune from him.
http://www.youtube.com/watch?v=53eAvrknuZA

Sufjan Stevens is another one of my favourite Christian artists, though he doesn't really write worship music. Sometimes, but not a lot. Another favourite is The Welcome Wagon. They do worship songs.

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"I didn't go to religion to make me happy. I always knew a bottle of Port would do that. If you want a religion to make you feel really comfortable, I certainly don't recommend Christianity." - C S Lewis