As for best headphones, i think most audiophiles see the HD800 as being the best headphone money could buy overall. But the best sounding headphone in the world is probably the stax 009 which cost 5 times more than HD800 at $5000. The Stax needs special amplification for its planer magnetic drivers so your looking at 3000-10,000$ Extra for a dedicated amp! The HD800 on the other hand is probably the best headphones with a regular headphone socket that can be used on a reasonable sound source.
But i think those are probably way above anyones budget here :P. For less than 400 quid, the best sounding headphone you can buy is probably the Sennheiser HD650, they are one of the most recommended headphones by audiophiles for quite a long time and still is. They are not the sort of headphones for outdoors, they are fully open design so they leak noise (but as a result gives you this immensely satisfying natural well spaced sound which makes you feel at the back of a stage). Those headphones are quite hard to beat. Although now there not that expensive, they can be had for the same price as Beats Studios, ( around 250) which is nothing for a headphone of such calibre.
If you want the best headphones you can use everywhere (in your mp3/ipod, outdoors, in library etc), i would say the AKG K550 is unbeatable. I own a pair and they are almost perfect. They cost 250 quid, so as much as Beats Studios but thats where the similarities end. They are extremely efficient, with an impedance of 32 ohms (compared to other reference cans) so they will work very well with mobile players and dont require amplification. They are as well built as a 1960s mercedes 600 limo, whole headphone is mainly made of very nicely machined metal (i think mainly steel, but very light none the less for its size), it feels truly premium
Last edited by SR21M; 28-06-2012 at 16:22.