SoundMagic ES18I've owned the green versions of these earbuds for like two years now. If you can get over the cruddy build quality, the sound quality of these is pretty good (for the price). Bass is surprisingly punchy and doesn't muddy the other frequencies or clip like trash. It's mostly neutral until you hit the highs, which are pretty understated. You might find these a little muffled at first, but if you give them some time the sound signature will grow on you. The highs will never be sibilant or fatiguing. Decent amount of detail.
Be aware that the driver housing might split apart with extensive use. Mine split apart constantly since whatever adhesive they used to fuse the two halves wore off, but the sound coming from them is still flawless.
Other choices (haven't tried any of these):
The
MEElectronics RX12P also get good reviews, though some complain that the bass is overpowering and can muddy the sound.
Someone on the BL forums previously suggested these
Monoprice earbuds, but I don't know how they sound like.