If you have a Guitar Center nearby they should have a display with a few to try out. The one around here has Shure, Beyerdynamic, Sony, and one or two others.
Thank you tubeglow..... numerous guitar centers here.... decided (for the moment) i am going to go with the beyer 770 250 ohm cans!!!! unfortunately they dont display those ones to test before purchase.... and just found out the ones i want are online order only...