What are some good 5.1 surround sound headphones?

[Whitman82]

I went ahead and got some LTB-USB-M 5.1 headphones from tigerdirect, and i must say the sound is pretty impressive. The surround sound effect is definitely there. But now i'm a little confused as to which audio setting i'm supposed to use when playing games. For some games, like doom 3, the only one to choose from is surround sound. But games like medal of honor pacific assault let me choose from headphones, surround sound, and 5.1 from the audio settings. Which one would 5.1 headphones fall under?

[MusicMan]

well, you could try them all and find out which one gives you the best effect