Some of my favorite metal right now is by christian bands
Check out the first Norma Jean cd Bless the Martyr and Kiss the Child... this cd is absolutely CHAOTIC breakdown music to the point of "turn that **** off" the first few times you hear it. It grew on me over the course of mid 2005 and became my fav cd of 05 (even though its 2 or 3 years old) - just ridiculous.
if you've got any p2p's, d/l Memphis will be laid to waste, I used to hate cell phones now I hate car crashes, It was as if the dead man stood upon the air, and The shotgun message. I personally like the whole cd a lot except tracks 7 & 11.
As I Lay Dying is pretty much rock your schlong off stuff as well. These bands are MUCH easier to listen to after you accept that the vocals are mostly scream/growl.
d/l Elegy, 94 Hours (omg machine gun double bass), Forever, the beginning, etc etc
Awesome workout music, Norma Jean will put 45lbs on your flat bench guaranteed.