My iPod earbuds have finally started to give way, so I want to get some replacements before the cable gives out and I lose stereo.

The options seem to boil down to the Sony EX71 or the Sennheiser CX300. The EX71s come recommended from a number of people just off the Flickr photo, but do have a number of complaints about build quality in the Amazon reviews. The Sennheiser’s are in at the same price point, have better Amazon reviews and therefore strike as possibly a better option. Does anyone have a preference for one over the other though?
The other option is to spend a little more (£40) and consider thea Shure EC-2 earbuds. I do listen to a heck of a lot of music on my iPod, so whilst I can’t afford to go nuts, I’ll go to £40 if it’s going make a worthwhile difference.
What does the internet say?