I'm in the market for a closed can for roughly $150. I narrowed it down to the AKG K271 MK II and the Audio-Technica ATH-M50 but I'm open to suggestions. I'm not extremely picky about sound signature except I want a natural sound, I'm not sure if this is considered neutral or not. I recently got the AKG K240 Studio and I love their sound, their ability to reproduce instruments with a life-like sound has charmed me. I'm aware that the K271 is a closed version and sounds similar to the K240, so I am sure about the K271 in terms of sound. Do the K271 have durability issues? my K240s are already cracking in the right cup and they are only 2 months old, the cracks cause a slight rattle on sub bass frequencies on the right side, I plan to send these in for repair of replacement when I get back home. My question is about the M50 or other closed cans in this price range, do they sound quite natural and offer good detail? Anything over $170 is more than I want to spend. My old cans are the HD 555s, but they sound quite unnatural on most instruments and sounds, so I don't want anything that sounds like those particular Senns.