Well, let's see here......
why did you post two threads?
Anyways, I'll see if I can shed some light, consolidate some of the information that others have given....here are the headphones you should be considering. Info is hearsay, except with the KSC-35's.
Koss KSC-35 (small, cheap, earclips, open, balanced sound)
Koss Sportapro (small, cheap, open, normal headband, bassy)
Koss KSC-55 (small, cheap, behind-the-neck, open, bassy)
Sennheiser MX-500 (small, cheap, earbud, open, balanced)
Sony MDR-888 (small, slightly expensive, earbud, open, midrang-y and musical)
Sony MDR-EX70LP (small, slightly expensive, ear-canal earphone, closed bassy)
Sony MDR-V6 (midsized, slightly expensive, closed, accurate, can fold)
Sennheiser HD495 (midsized, expensive, open, accurate but musical, kinda hard to drive)
Koss UR-20 (full sized, cheap, closed, bassy)
Koss UR-30 (full sized, cheap, closed, bassy, can fold)
Philips HP550 (full sized, cheap, closed, accurate)
Denon AHD-750 (full sized, closed, expensive, accurate but musical)
Denon AHD-950 (full sized, closed, expensive, accurate but musical)
Etymotic ER4P (small, ear-canal earphone, closed, EXPEEENNNNSIVE, god's gift to earphone lovers)
Beyerdynamic DT250-80 (midsized, closed, EXPENSIVE, accurate, kinda hard to drive)
Sennheiser HD25 (midsized, closed, EXPENSIVE, accurate, can fold, slightly bassy)