I might be biased since I'm selling my pair (bought a set of ES5), but the W4 sounds right up your alley, albeit with a very generic EQ modification for 'bass enhancer' that is available on any media player. I think this would be the best of both worlds: quantity & quality. It isn't that the W4's 2 bass drivers can't produce quantity, they're simply designed to be more natural all around. I enjoy them very much with no EQ, or with a V shaped EQ, or with enhanced bass EQ... all depending on the music but mostly my mood. I've got a set for sale for $385 shipped, I'd be glad to give you a couple day trial.
FYI I have listened to the Monster Turbine Pro Coppers & Klipsch S4, both of which are dynamic drivers, both of which are outdone in the low end by the W4, even when EQ'd for extra bass. I'm assuming in saying this but I can't imagine the Coppers can't produce just as much quantity of bass as the Golds when EQ'd to do so.
Yeah, I was thinking W4 would be a good choice too. I listen primarily to Electronic music, Dubstep, Glitch etc. and I've got the EQ setting for W4 perfect - the same EQ setting doesn't have the same impact through TF10, and even my Klipsch X10 can't match the bottom end. They have a bottom end and separation unmatched by any other IEM I've owned, or tried.