In reply to:

All things I have heard say cordless just isn't quite up to par compared with corded



That is true for all but the Audio Technica headphones. But then again, not many people really want to spend that kind of coin on a headphone system.

Apparently the new Sony wireless headphones are supposedly quite good as far as not losing the signal.

Some products like Pioneer's SE-DIR2000C Dolby Digital Surround Headphones have a headphone jack to make them "wired" so you have the best of both worlds.

Here is a good link with options:

http://www.audiocubes.com/category/Headphones,+Earphones_Wireless,+Surround.html