Earphone advice needed please, replacement for UE Super Fi 5
Background: My Ultimate Ears Super Fi 5's have broken after 8 months use (one of the earphones no longer works), which was very disappointing as they were the most expensive earphones I've owned. I blame myself, I could have looked after them better. My previous earphones, Sennheiser CX-300s, lasted a lot longer, and I found them to be of higher build quality than the Ultimate Ears (though poorer sound quality).
Although I was generally happy with the sound quality of the Ultimate Ears I don't want to spend that much on a replacement pair only for them to break again. So I'm tending towards something slightly cheaper (but not too much cheaper) than the Ultimate Ears. I'm considering the Sennheiser CX-870 - but going from the Ultimate Ears would this be too much of a step backwards since I was spoilt for sound quality?
In terms of what I'm looking for; I liked the Ultimate Ears sound for most tracks, but I found they didn't cope so well with "big" sounds like orchestral or metal music, then the quality would drop off. I'd like something more universal, as I listen to a wide variety of music. Secondly, I like to have good bass but as long as it doesn't drown out the mid-range and treble too much (which is what I found with the CX-300), the mid-range and treble were the biggest improvement that the UE's gave over the CX-300s and I don't want to go back on that improvement too much. But I'm not after perfection, just something that I won't mind listening to having been used to the Super Fi 5 that costs as much or less than the Super Fi 5. I'm buying these to use with a Cowon S9.