Well, I see I responded too late...

My personal preferences are
1. Etymotic ER-6i http://www.headphone.com/guide/by-ma...r-6i-white.php (although I now have pair in black)
2. Bose QuietComfort 2

Really like both and I've been through a couple of headsets (due to upgrades; leaving them behind on airplanes; etc.)

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2008 X5 4.8i | Wheels: Summer> style 336 20" RFT; Winter> style 214 Ferric Grey 20" RFT | Aero kit | ESS E-Flash tune | V1 | LCI Rear Tail Lights | Coding completed | Engine replaced at 90K