I was considering getting a pair of 5.1 headphones like the Tritton AX360 or the Turtle Beach Ear Force X4s, but I've started been swayed towards a decent set of stereo heaphones. I was thinking about getting a set of Sennheiser 555 and plugging them into my Yamaha RXV-361 amp. Would I get a decent surround effect this way, or should I also consider getting the JVC 5.1 headphone adapter. Also, as the Sennheisers are open headphones, how much sound would be leaked? I'm going to use them when the other half will be watching TV/sleeping, so they can't be too loud? Or are the AX360s good enough? I've heard there is a lot of hiss with the X4s. Any help anyone?