In one of my H/S/S guitars I have a Distortion/Cool Rails/Hot Rails and in one of my H/H guitars I have a pair of Distortions. If you want heavy, there is nothing better.
The Guitar that i have is a Kvx10 jackson king v, the amp that i am using is a 100 marshall MG series and a Yamaha DG Stompox....My favourit bands are Testament, Children Of Bodom, Megadeth And Pantera.