Whitetriton
100+ Head-Fier
I've been to Mission Valley Best Buy and listened to their more expensive headphones. It was fun. If you go to do this, I suggest you bring a 1/4" to 1/8" adapter as a lot of their headphones have 1/4 plugs. With the adapter, you can use your portable device with an 1/8" jack or the mac they have on display. When I went a while back, they even busted out an Audioquest Dragonfly and let me try that out. Definitely fun.