"iem with decent bass $200"
The Future Sonics Atrio M5 (black) and M8 (Blue) exceed your requirements -- the bass is far better than decent, without overwhelming the mids and highs. What's more, they can be obtained for less than your limit (via eBay). Really an impressive sound from these things. They don't require amping and sound very good with iPods, for example.
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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