Deleted the comment since I re-read what you said, you replied before I deleted it anyway.
As for the extreme sound, I guess for the Hillsong thread I meant, they don't have too much "boom" compared to other music of that genre, if you hear some of the modern pop songs, they have heaps of boom, and electronic dance music is heavily used with it, I guess that's what I meant by extreme, Hillsong doesn't go to that extreme, they still would be considered as what I would call easy listening contemporary pop Christian music, in saying that haven't heard much Hillsong recently, but we do sing a few of their songs at Church.
As for Christian hard rock, I am not sure if I have heard Disciple, but I can tolerate quite a bit of rock, a lot of the rock lead guitarists in general are very talented, and I do like some good instrumental talent.
I know this isn't Christian hard rock, but Alice Cooper (now a Christian) currently has an amazing lead guitarist Nita Strauss playing in his band, she can really make the electric guitar sing.