I'm looking for a headphone for tracking and mixing. And before any of you guise say it's a big no-no to mix with headphones - yes i'm aware of that but atm i need some cans and because of work I'll be doing my mixing at late hours so a headphone is what i need. My price range is not so high so i'm down to two options: Audio Technica ATH-M40h and Sennheiser HD 428. I'm looking for a frequency response as flat as possible (and yes they won't be colorless in terms of sound, but I'm guessing they will beat my 10 dollar philips headphones lol!) Which one would you choose? Any other brand or type that I missed in the same price range with more juice?