Also, the DT770 sucks if you're going to use it for (A) gaming and (B) aren't buying a $1,000 amp to go along with it.
My reasoning is something like this: I owned the DT770 and the DT250-80. While the DT770 had more of a high end, it also had a very colored sound and it is too bassy for gaming, i.e, the bottom end sounds bloated, thick, and out of control, which makes it difficult to track opponents because the ambient bass is so loud.
The DT250-80 puts you in the "hotseat" and is sure to keep you awake while you game. It makes things up close and personal without revealing the horrible quality of your game's ogg vorbis at 64k loops (snicker) or your game's poorly recorded mp3 music files.
I think that while the DT770 is a fun phone, its ultimately not as good as the DT250-80 for gaming, and requires at least a thousand dollar class A amp to settle down and control its ridiculously overboosted bass. Again, if you want bass for gaming, probably this phone or the sony V700s are the best choice, but they absolutely fail to deliver on an "upfront" sound required for gaming and so on.
Bangraman,
I don't understand what you're talking about when you refer to the DT770 having better "image cues." The DT250-80s have MUCH better imaging when it comes to midrange sounds (vocals) and do just as good a job, if not a better one, at pinpointing the direction of footsteps. Both headphones (and all headphones in my experience even in binaural situations) can't help you with front/back sounds. You'll have to rotate your character 90 degrees to hear where the sound is coming from with either phone.
If you get a DT770, you'll end up cringing and buying a $200 amp, then cringing some more when you realise the overly bright treble won't go away but merely gets louder. Save yourself the pain and get the DT250s!
I'd recommend the AKG K271S but it needs a class A amp as well (it only started sounding good for me on the headroom cosmic reference or maxed out home).
Cheers,
Geek