Just to update: I got the FA-003's from GD-Audiobase, and I absolutely adore them. When I first got them, everything sounded pretty good, but the bass and midbass was really tight and conservative upon first impression.
Just ran them through my playlists last night, and boy, did it open up! Everything sounds so amazing! Trebles are nice and pronounced (but not overpowering or 'crisp'), mids are liquid smooth, and the bass... Oh, the bass is just so perfect! The soundstage on these things aren't as big as the 555's though, but not so much as to want to switch back.
HIGHLY recommended for those looking to upgrade their HD555's! I can't even describe how amazing these cans are!
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