If you're keeping the Gibson 496R neck pickup and you're happy with it, then I wouldn't worry about picking a bridge pickup with too much output. The 500T you have already is the hottest pickup Gibson makes.
For all-mahogany guitars Tim always recommends either vintage-output pickups or high-output ones. The medium-output pickups can have a tendency to get muddy because the mahogany itself contributes a lot of bass, but the high-output ones can "drive through" the timber (I've read this stuff a
lot, because most of my own guitars are mahogany!)
I don't own any of the high-gain models myself, but - from what I've read - I reckon the Warpig would be too dark for what you want, which leaves Miracle Man, Painkiller (and maybe Nailbomb). The MM and PK both have ceramic magnets like your 500T, but they'll sound much more clear and defined than the Gibson.
Or, some of the guys on the forum have a Custom Warpig with a ceramic magnet instead of alnico, which gives it more crunch and definition. That may be the real EMG-killer.
And just to confuse things a bit more, although it falls into the medium-output range the Rebel Yell breaks the "rules" and works really well in mahogany, because it's really tight, bright and punchy. I think it's really more of a Big Rock pickup than a Metal one, but others may disagree.
And may I echo Mr 38th and say welcome aboard! :D
Garnered, that's a good word.
