I don't mean to derail this thread, but surely I'm not the only one who thinks the JB is pretty damn gainy in itself? In my case I did not find it much lower output than the Distortion, if any, and in my experience, both the JB and Distortion hold up with EMG 81's as far as power goes quite well.
I mean, yeah, I'm sure the Distortion might be a bit hotter, but I personally don't feel like they're in a completely different league as far as power goes. JME.
I'd say if you want to leave those kind of output levels, you might want to look into a Dimebucker, some of the higher output DiMarzios, or maybe Blackouts?