there are a few things i want to reply, first, the difference between the shure c version and the g version is exactly the same sound wise. the g version has a longer cable and it's all black in color.

the shure has a new line. i tried e2c and e3c before. i didn't like it at all. i read some good reviews about the new se210, se310. i'm going to get one later this month, or next month.

as for ety. it's know for it's good high. and very detail mids and tight bass. what i mean tight bass is good clean bass with going bassy or boomy.

one suggestion. if you want more bass than ety but not too much bass, try ultimate ears super fi 3 or some westone.

Fritz, i read shure has great customer service. drop them a mail and see what they can offer.
audio_dude, i think you need to try some ety if you can take shrill highs from my experience, er6 and er4s need an amp. er6i or er4p don't need one but will sound better with an amp.