Would be easier if you tell us how much money you gonna spend...

First of all 5.1 headphones is pure marketing bullshit, though fanatic 5.1 users will try to tell you something else, no offense

If you want to 5.1 headphones works in 5.1 mode you need 5 pairs of ears But since you probably have only 1 pair they will never work in 5.1 mode. Regular 5.1 speakers is completely different story and there 5.1 system is possible.

Like ppl said above, first say a sum of money then we can give you advice.

Another myth is "headphones for games". There are only good and bad headphones. No matter what you use it for. On good headphones music, movies and games will have amazing sound. Therefore you should always buy them in ordinary music store not any crappy gaming store.

You find many good producers like Sony, Philips, Koss, Sennheiser. Still last ones are considered to be most reliable and above 30-40 eur every model is nice. Not to mention high-end models for 250+ eur.

Also you need sound card if you want better sound. Headphones on their own are far not enough. Even cheapest additional sound card is far more better then usual on-board crap.

Headphones in reasonable prices, unless you are some sick audiophil , are Sennheiser HD 205, HD 215, HD 270, HD 415. More expensive ones are 515, 555, 595. One of them is going to be my choice when my Koss's will die.

Best thing to do is go to some music store or even Media Markt try them all and then make a choice.

biggest bs ever, they sell cheap speakers which got luckily a bit incrased sound on the frequenz where footsteps are played for 50 euro.

@van
i for myself run fine with a hd555, its rly good to hear any silent noise, but on another note, due to its low ohmic resistance u can also hear ur mouse moving in windows etc and no volumen control on the headphones (which are bad for the signal imo)

i didnt say that medusa has same 5.1 effect that some 5.1 speakers connected to dvd player... i think u never used some of them on bass tests your head is getting nice massage.

For 150 euro I would start looking for used beyerdynamic models...dont order online,cause u should deffinetly try them out first.And Van is deffinetly right,if u have onboard crap audio it will affect your audio quality pretty much.I took a used sb live! 5.1 card for very cheap money and am very satisfied.The difference compared to realtek integrated crap is HUGE,to say the least.