if you want a great amp with a great tone for metal, please try the peavey 5150 amp.
It's the one that Edward Van Halen uses (and not only him, check out the peavey website to see which artists are using the amp)
The 5150 exists in combo and head/stack.
It's an all tube amp of (i think) 60 watts, but it sounds like a massive wall of distortion.
Really check it out!
Feel free to contact me if questions
Keep on rockin'