Anything on the solid state music label is also going to be super hard, not all death metal, like living sacrifice etc... but some super hard stuff.
There are great bands out there... one of my favorites is Project 86. They hate to be catagorized as a Christian band, they feel that labels such as Christian and non-Christian music is constructing a false dichotomy, but they deal with many Christian themes. One of their recent songs, S.M.C. they got a lot of flack for, because of their criticisms of the church. But they do it to promote social change.