Alternative headphones for my 3Gs

I am looking at changing my out of the box apple headphone for some new as the apple ones just fall out of my ears and are not that loud when a lot of noise around me.

I seen these in the apple store:-

Sennheiser MM 50 iP

These are around £50 which is my budget. Some review say that the bass is on the high side and also the microphone is too big.

What are you thoughts/opinions on what I should go for? I would prefer some in-ear headphones..

I used to have some in-ear apple headphones but these kept on coming out, even when I changed the end pieces.

Do people generally feel that the headphones with the longer right ear cable are better? I want to use to lisiten to music/films whilst on holiday, also when I go jogging..

Thanks
Mark