I had your requirements exactly (albeit a tad more budget-restrained). I got really helpful advice on my now-defunct thread, but the main competitors were:
Atrio MG7 (won), 200$ price, you can find it online for 100$ since it has a special discount. "Bottomless bass... not only powerful but punchy and accurate and doesn't bleed into the mids like other low tiers dynamics do."-joker
It is supposed to have really really really good bass that doesn't overshadow anything else.
FX700 (mine were FXT90, but the FX700 is like a better version of the FXT90): supposed to be energetic and balanced... also a dynamic
TF10: Classic phones but not really for bassheads... people here dream about them at night... not kidding. (10$ a TF10 fan will **** bricks because of my bass comment.)
Yamaha EPH-100: Supposed to be really good: EXTREMELY long appreciation thread: http://www.head-fi.org/t/577712/yamaha-eph-100
But all these are under-budget really...
BTW, 200$< is the price range where the phones become much more expensive with significantly less sound improvement. Bang/buck nothing beats the above price range. ALTHOUGH this is based purely on what I've read on these forums and not personal experience.
Edited by Beatbox - 1/23/12 at 2:06pm