Hey! I've had my M50's for a while now - I use them to listen to music as I go to and from places by bus and train, plugging them into my iPhone 5 or my iPod Classic 120Gb. - and I was wondering what would be a step-up from these amazing cans in as many aspects as possible. Obviously it would be dumb to think there's a pair of cans better in every single way.
So, what would be a step-up from the Audio Technica M50 in audio quality, build quality, portability, sound isolation, noise cancelling etc.