Does anyone know of any good quality yet affordable earphones?

And by good quality earphones; I mean ones where the right phone's sound doesn't rapidly deteriorate after a few weeks of being purchased and by affordable, I mean preferably under £15 or £20.

OK, so I'm learning about the home recording process and on Tuesday I will be doing my first session. I believe I have the recording equipment side of things right. Now, the issue of the listening device comes up. The store I've been buying equipment has lots of different headphone brands and so on. Headphones seem to be the standard for recording purposes. Why? What's wrong with earphones?

A first time begginer...

Can someone recommend me a good recording studio earphones?

Are ther some of them that can achieve a good low frecuencies reproduction?

My purpose is the digital recording. I have a midi file, and I record it with VST sounds.

Thanks!

I'm not sure that this is the correct forum to be posting this question in, but it seemed to be the most relevant (I will delete/repost in a different one if desired)... I'm in a band and am looking for some good earphones to take with me on the road/when I travel (instead of constantly worrying that my Sony MDR-7506s will get crushed in our van).

Ive been using a pair of AKG -K240 55 ohms,for play back and for final mix downfrom working with the set of cans---I adjusted and and learned how to use the set-----so with that said,I decided to purchase a second set to try to make it easier to mix "at times".

OK folks, I hope I don't sound too ignorant here, but I want to know what you think about something. I have a very small room 11' X 11' for mixing. I have had a hard time getting the EQ to translate to other systems. I have no problem with levels and the basics, but the EQ ain't happening.