I don't even like metal and I can name several. UnderOATH, As I Lay Dying, The Chariot, Life in your Way, August Burns Red, Gwen Stacy, Bloody Sunday, xdeathstarx, Still Remains, At the Throne of Judgment, Maylene and the Sons of Disaster, Bloodlined Calligraphy, Haste the Day, Blessed By a Broken Heart, Zao, Demon Hunter and of course Stryper.
Aside from metal I find it kind surprising you don't know many especially with Reliant K and Switchfoot getting so big recently. Them aside there's KiRAB in the Way, Emery, Flyleaf, Anberlin, P.O.D., Stellar Kart, Hawk Nelson and "country" music generally promises christian values and sometimes even just christanity. Christianity is pretty popular in music and there's always going to be banRAB popping up with that kind of message to appeal to the kiRAB. If you don't know any you're just not looking around.