Do a search for Future Sonics Atrio M5s -- they should be a contender as you consider which earphones to get. "Big" sound that conveys bass and kick drums especially well. Excellent value in terms of cost vs. performance.
The M5s and the super.fi Pro's are relatively large (not necessarily uncomfortable, though ... but certainly substantial, if lightweight). Smaller 'phones that are said to have a more detailed sound would be Jays and Etymotics.
Oh -- does your player EQ well, or is it a Zune or iPod, which don't tend to EQ to the degree that some brands can? Synergy with a player or the ability of a player to EQ (or not) can play a role in your choice.
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Phones (in order of purchase):
Sony MDR71, Sony MDR51, Etymotic ER6, Panasonic RP-HJ50, Shure E3C, Koss PortaPro 2, Creative EP630, Etymotic ER6i, Sennheiser PX-100, Sennheiser HD555, Future Sonics Atrio M5