You've probably heard a couple clips of my Peavey Prowler - that amp is basically a 45 watt Peavey Ultra and can definitely do metal on it's own. Of course I'm a boost junkie though
Another cool thing is the amp has a KILLER clean channel....better sounding than a Twin Reverb actually IMO (but not nearly as loud).
When I get a lil time I can try to do a short clip of the amp, unboosted.