The Etymotic HF2 is apparently 90% of the sound signature of the ER-4 in a smaller footprint. The new $80 Apple buds just came out but the reviews seem suggest they are comparable to other earphones in that price range. Gizmodo preferred the Shure SE110 but I have not found a single driver earphone that had sufficient bass (the Apple buds had less bass than the SE110's according to the review.) If you can swing $150-200 you can get some Ultimate Ears super.fi 5 pros or Shure SE420's (check ebay.) You'll be in a whole different league as far as sound quality.

http://gizmodo.com/5102091/lightning...ear-headphones