when alexi had his jackson's he was using there jb-50c humbuckers with a jackson booster switch in it as well (i believe it was the jb-1000) after they were stolen and he got his esp's he switched to emg 81's with a pa-2 for a while then switched over to the hz-4 with the pa-2 gain switch when i play bodom songs i use a dimarzio x2n with a booster switch that i got from neal moser and it absolutly kills for getting that uber heavy metal tone, in fact when i met alexi and the bodom boys there were suprised how huge a tone i had, if you play heavy metal of anykind i have to suggest the x2n, it nails it completly plus with my booster emg's cant touch the output i get!