Ultrasone HFI-650 have been my headphones of choice for the past three and a half years and I couldn`t be happier. They have this lovely, natural sound with deep, tight bass, massive 3D soundstage and a very detailed presentation. They will reveal everything there is on the record. These are somewhat tough on the ears, but they are built to last and offer more than a decent isolation. Also, they will deliver regardless of being plugged into a small flash mp3 player, or a hi-fi receiver. The price is high, but you get what you pay for and the headphones are worth every cent. They are great for all types of music and movie soundtracks.
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Ultrasone have plenty of other models to choose from if you want even more bass (HFI-700), a DJ headphones (DJ1), or more refinement in sound (the Pro line). Check them out HERE.