Todd,
I'm probably going to go against the majority, but I don't like the tone of the Grey Ghosts...at all.
The level limiter circuit muffles the tone, and kills the 'brightness' of the signal.
I didn't really notice how bad they are until I tried some others.
After some testing, I'm now convinced they're the worst sounding headphones out there.
(Picture yourself listening to someone who accidentally covers the microphone of their phone while talking...it's that bad.)
Killer B's are great...SunRay Pro Gold are great...
And get this...the DetectorPro UniProbe headphones DON'T have the limiter circuit...and they sound GREAT!
(Made, of course, by the same folks who make the Grey Ghost.)
I also use some semi-custom earbuds made by Westone Labs in Colorado with the wireless module...for those times when too much sweat builds up in the headphones.
They're expensive, but sound great. (Much better than the generic junk you can buy off the shelf.)
Good luck, and
HH
Mike