I'm testing too for what the best sound will be on my headphone! Sennheiser PC360. The problem I have, is losing power in the sound when I turn on Dolby HT. The sound will be more detailed (specialy surrouning sounds) but when you shoot your own gun in mw3 or BF3 its really weak (also with explosions)! In Dolby HT I only ussed the volume eqeliser and 4sure not the surround virtualisator cause it looks like walking in a big hall. You guys got some more experience?
I think the best too play with is no suround programm at all, just set the impendantie on high to get a really powerfull and detailt sound.