I have been looking for a pair of closed-back headphones with a good seal that won't disturb anyone around me or vice versa, that are comfortable enough for listening periods upwards of 2 hours, and that have a flat enough response so I can use them to create music as well as listen to it. I've tried the ATH-M50's but found that they didn't fit on my head correctly and were very uncomfortable. I've tried the Beyerdynamic DT-700's which had a great seal and were like clouds on my head but found they were severely lacking in bass response. I then tried the Beyerdynamic Custom One Pro's which fit the bill with comfort and seal, but were lacking in the mids and had too much bass for their response to be considered anywhere flat. I have been considering several headphones, and I wanted to hear what people have to say about them as well as get recommendations for other headphones. The headphones I've been considering are: AKG K550's AKG Q701's SoundMAGIC HP100's Shure SRH840's Thanks, AudioConbob57.