Y'all are on the right track for the most part. U2 and KX would be the best examples I think. Lance King's stuff is probably good also.
The last 2 LNJ at least have been concept albums telling the story of someone from a Christian perpsective. Justin just gets a lot of famous secular singers as well to lay down the vox.
Impelleterri could be considered as long as Rob Rock is the lyricist. Chris doesn't write any of the lyrics.
Switchfoot is a Christian band but are in that vein like Bleach where they aren't all that bold - they sing a lot about relationships, having fun, etc in a clean manner.
As for Lifehouse, I've heard them discussed in Christian circles before but they are the "Christian(s) in a band" as you mention. You can clearly see their faith in some of their songs.
Norm would be a good one to add to this topic as he listens to a lot of "safe" bands.
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"If you are not concerned about your neighbor's salvation,
you should be concerned about your own."