At the moment, has Sennheiser HD600 reduced to $249.19 Edit: Also $249 at headphones.com Thanks to Rhodey for pointing that out. See his provided link below.
Sennheiser Hi-Fi Professional Stereo Headphone, Model HD600 The HD 600 is an audiophile quality open dynamic hi-fi/professional stereo headphone. The advanced diaphragm design eliminates standing waves in the diaphragm material. The HD 600 can be connected directly to hi-fi systems of the highest quality, in particular DAT, DCC and CD players. This headphone is an ideal choice for the professional recording engineer recording classical music.
Sennheiser HD 600 Headphones
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Sennheiser HD600 Open Dynamic Hi-Fi / Professional Stereo Headphones
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.com: Sennheiser HD 600 Open Back Professional Headphone (Renewed) : Electronics
Sennheiser HD 600 over-ear open-back Headphone - Official Thread - Official Headphone Model Discussion - The HEADPHONE Community
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