Depends how much you want to spend Rhys? my Grado's are awesome, combined with a dedicated headphone amp I have heard things I've never heard before on records I've owned for 10 years!! and thats played through Łk's of hi-fi.

Grado's are deffinately up there with the best, never really heard of bose spoken of when quality headphones are mentioned price doesnt mean quality

I'm looking into a pair of Stax ear speakers, probably the most involving headphones on the market, well worth a look IMO, I just need to dem a pair before I commit to buy a pair.