I happen to like the DiMarzio Tone Zone for the bridge, but you say you want to focus this axe for metal, right? So, put the Tone Zone at the neck, and get a DiMarzio X2N for the bridge. That's the highest output passive pickup on the market, so it can definitely overdrive any amp you plug into. But what makes it interesting is that it cleans up nicely when you turn it down, and that adds some useful versatility.