Tonebone hot brit is an intense Distorion that will crush any metal pedal out there. Its pricy but well worth it. here is the link
If your wallet lacks the funds, well I fount that the Electro Harmonix pedal called "the metal muff
YOu are forking out 100 bucks for an amzing pedal.
here is the link as well.
My other disovery is the cooltron Bull Dog
from Vox. amazing distortion but a bit pricy for what it is. I rather invest on on the Tonebone hot brit.
also, try out the new Kerry King EQ from Mxr. What a diffrence an EQ could make.
Boss distrotion are heavy but lose bottom when cranked unless you have a great amp. Tone bone sounds good on any amp.