I don't know what's good with pedals because I don't use a distortion pedal. I found the Metal Zone to be way too harsh, so when I finally got a good amp (a 5150) I just started using the tube overdrive. For my style, which is now bent more towards blues, this works perfectly. When I do play metal, I usually just turn the gain up and monkey with EQ until I get a sound I like.
BTW, I also send the 5150 through a 15" and two 10" Peavy speakers, a black widow and two scorpions. Depending on what tone I want, I just mic either the 10" or the 15" both live and in the studio. Of course I've got a passive, too, which is just a dummy 12" to relieve the air pressure difference, and a lot of live engineers try to mic THAT!! Anything will sound better than a passive 12".