Isolation isn't really important, as its usually quiet around when i'm listening to music anyway. If others hear my music when I am playing it, then thats not my problem, heh. The whole reason that I started listening to music with headphones so much is because the rest of my family don't like me using my speaker setup.
I love high grade audio equipment, but due to financial constraints, I can never afford anything that truely makes me happy. But, a headphone setup is much cheaper
I would like a speaker setup too, but it would cost me up to £1500, while a pair of A900's cost £100.
Basically, isolation isn't too important, comfortability is. Being capable of sounding good no matter what the type of music. I can't afford a set for type A and another set for type B like some people here can, I can afford one set of headphones, thats it
Working very well out of the box without a headphone amp would be good too, because I don't want to have to shell out even more money just for an amplifier.
At the moment I have no good headphones, just a pair of Plantronics Audio 90's, which can't produce an enjoyable sound no matter what, they just make me turn my music off, so it will be great to have a nice set of headphones again