Hey everyone, I need some urgent feedback and help on choosing between 4 headphone monitors, and since the local vendors don't actually have these models, I'm having it shipped and so I can't try any of them till I actually buy them. I HAVE done quite a bit of research, and I have narrowed it down to these 4 - 5 models. The Sennheiser HD 380's, the AKG K 240 MK II's, the AKG K 141 MK II's, & the AKG K 121's. The headphones monitors will be used for HOME production of electronic dance music (trance) and will barely be used for personal audio or DJ'ing. I have a few criteria/conditions which might help you guys narrow my search down: - I need headphone monitors that will work great WITHOUT needing to buy a headphone amplifier. - I don't know whether the headphones I need for mixing/monitoring should be closed, open, or semi-open. - The headphones WILL be used occasionally for long production sessions of up to 6 hours at a time, so comfort is important but not as important as the other conditions. - I need the headphones with the FLATTEST frequency response (across the spectrum), so that what I hear is what it actually sounds like and what it would most likely sound like if played on club speakers. All I have to go on is your feedback guys. Kindly keep your responses specific to the models I just mentioned, unless there is a better monitoring headphone I am missing out that is either AKG or Sennheiser (I narrowed it down to those 2 brands for sure) that is below $145ish (that's my budget). Some notes from various reviews I read: HD 380's: Have a good "audio/sound stage" but produce some kind of hissing sound...and need a volume attenuator and/or a headphone amp to take care of that problem...can anyone verify that? I'm on a limited budget, so if I buy the 380's I won't have any/enough cash left to buy any extra stuff like the amp or the attenuator. Also, closed headphones, so some sound stage is lost? But better than the HD 280's? K 240's: Semi-closed so there is some leakage involved, and so you don't hear everything you're supposed to. Also read that they tend to give a boosted bass response, which tends to muffle some of the mids. I also heard that AKG's in general and especially the K 240's need a headphone amplifier to work properly, but as I said I won't have money for that, so does anyone know if they will work properly without the headphone amp? K 141's & K 121's: Aren't as comfortable as the 240's and response isn't as flat and sound stage isn't as wide as the 240's. I know about the AKG K 271's, but unfortunately I can't afford them Help?! Thanks in advance people!