Some cool Christian hard rock/metal bands out there for sure. Just a few off the top of my head: Kutless (older material), Skillet, Thousand Foot Krutch, Pillar, Decyfer Down, Ashes Remain, RED, Nine Lashes, The Letter Black, Sent by Ravens, Day of Fire, Fireflight, Flyleaf, We As Human, Disciple, 12 Stones, Demon Hunter, Love and Death, War of Ages, etc....
I could go on and on with that list, haha. I'm in a Christian hard rock band that used to play out a lot and at one point or another we played with many of those bands, most of them are great dudes/ladies.
Also some cool Christian Contemporary artists out there right now too. Hillsong, Elevation Worship, Chris Tomlin, Phil Wickham, Vertical Church Band, Bethel Church, Tenth Avenue North etc...