But something objective to back it up would be great, too. That brain-training game on the Nintendo DS -- the one that had you distinguish two voices saying th

But something objective to back it up would be great, too. That brain-training game on the Nintendo DS -- the one that had you distinguish two voices saying things simultaneously -- your score on that game is a great way to evaluate headphones for vocal accuracy. Be careful though: the DS can't adequately drive all headphones, so you'll need an amp for high impedance headphones.