Beyer DT1350 - Tonally stunning, most neutral headphone I've heard so far, insanely short decay, it can handle any amount of splashy midrange pads and synths and keeps them all under control. Very revealing of source, but rewards you when you have it. One of the only headphones I listen to anymore, actually; it spoiled colored cans for me forever and started my love of linearity. Not the biggest presentation, which leads to my second pair, but it's big enough for portable use, and the seal you get with these is phenomenal. There's too much for me to gush over here; every section, the DT1350 excels at, bar the aforementioned soundstage/width.
Nice...I've had mine for 6 months just about and still am amazed every time I put them on my head. To date, the best $270 headphone Ive ever heard - portable or otherwise.