I have an EMG 57/66 set in a mahogany body/maple neck Ibanez S and they're very good. Articulate, dark, but not muddy at all. I run them through a Peavey 6505 MH and I don't even need a boost because they're so powerful and it's such a heavy, saturated sound. They really sound like passives and get more dynamic with a little roll back on the volume. It's an easy fix because you already have EMGs. If you're having issues with muddiness, it may be because of the shorter scale length so the first thing I would try is a set of a little bit thicker strings. If you're truly set on passives, I would go with DiMarzio Titans because of how articulate they are, and they have this characteristic 'purr' to them that Jake even mentioned in his DiMarzio demo. It's a smooth, but modern sounding distortion. I have the bridge model in an ESP LTD M-1000 and it sounds really good. Although it has a poor shielding job due to it coming stock with EMGs and me being lazy if you want a similar sound to the Titans, still articulate, tight and bright, I'd recommend the Dimarzio D Activator bridge. Really great pickup. I have both and would recommend either in an instant for a guitar with passives from the factory. But if you're lazy like me, try out the EMG 57/66 set, I don't think you'll regret it. Here's a link to a set priced at $200 if you're interested http://www.ebay.com/itm/282284349191 Edit: I should've mentioned, I use both the Titan and 57/66 set in drop a, so they should also sound good, clear and articulate in drop C.