What type of bass amp would you recommend for a heavy metal band (lots of lows but being able to cut through the guitars)? I've got my eye on the Peavy Firebass and Firebass 2, and an Ampeg B-25B. I basically have no idea what I'm getting myself into and I finally have enough cash to get something high quality, but I don't want to waste my time (and money!) making the wrong decision. Any suggestions?