I recommend a pair of ER-6's for clear articulation. They really need to be properly sealed in your ear to pickup the low end response. For when more low end is desired (with the sacrifice of some clarity), I recommend the Skull Candy Full Metal Jacket (the 11mm driver versions....there's also a 9mm model). I'm not a big fan of SC in general....mainly a lot of fluff and gimmicks. But they're a nice backup to have and feel a little more durable than the Etymotics. Each can be had in the $50 range (sometimes a bit lower, try fleabay).