Khnud, well since you want only heavy metal then I guess that rules out Mass 'Rock 'n' Roll Power at 25th Hour', which I love (It does have a few weak songs though, not a surprise.) So much great 70's stuff from germany.
Anyway I see already mentioned many good ones. Don't forget all the great D & S comps indexed here on the corroseum.
Black Hawk 'First Attack'
the Black Burn demo lp that High roller released.
Breaker 'Dead Rider' is great though that band was mentioned.
Gator lp is really cool for me, I think you would like it. (It does have a few weak songs).
Calderone
Dead Man's Fun
I think the Black Dragon lp is decent. http://www.youtube.com/watch?v=xKuXPku2zMY
Ok, I'm tired of digging now, many more to be discovered...