Ok, i got a NS2000/4 with active EMG-HZ soapbars. I was wondering whAt kind of pickup i could replace them with for a little more growl and punch. Im also on a budget, not very tight, but cant get something really expensive. Also, do you know if the EMG-HZ pus have a preamp in them? would this mean that if i replace them i would need to get a new preamp?