Gonna chuck in my four-penneth, FWIW. I’ve used Sennheiser CX300’s which are cheap and cheerful, a mate had the Shure’s, replaced three times under warranty, finally replaced with Denon AH-C550’s, which are very good indeed, and just around the top of your price range, at £60ish. They have, however, just introduced a new in-ear ‘phone for £25, which ought to tick all your boxes, Denon kit is extremely good quality. I’ve also got a pair of Etymotic ER6i’s with custom eartips, which are excellent, if, at £150, kinda pricey. By far the best ‘phones I’ve ever used, tho’, are the Ultimate Ears Superfi 4vi’s, which have a mic and remote control for my iPhone. These were $124, but are just amazingly good, I’m continually amazed at how good these sound with 320kb files. UE’s actually start from around $25, so there’s probably something there that’ll suit. I got mine from earphonesolutions.com, and their service is excellent. The thing to point out, tho’, is that a lot of people critisise the sound quality of music files on iPods, when in fact a good pair of ‘phones will show that at higher bitrates you’re hearing differences in the quality of the original digital mastering; the Led Zeppelin ReMasters are bloody awful, for example, yet the Buddy Holly Original Master Tapes disc on RCA is incredible, for recordings made fifty years ago. Good ‘phones will repay the outlay by allowing you to hear those differences, so spend more than you might at first expect.