klipsch make some nice ear buds. have a look on their website
E: the image S4's look worth a shot, 52 quid online![]()
I would vote for the Klipsch S4i but the build quality is woeful. I've gone thru 2 pairs already. In spite of that they are very good.
Ultimate Ears Superfi 5s are a good bet. Not too bassy out the box, but can easily be EQed to suit, which is better than being the other way around IME.
They used to be available for ~£40 from a competitor, so it's probably worth shopping around for a decent price.
Guess I'm the only person who thought this was a thread about ear cleaners.
Soundmagic PL50s are probably your best bet for your budget, I used to have a pair and would highly recommend them.