I have HD 555 and just ordered HD 558. I been looking around for headphone amps and have my eye on the Fiio E9 and possible the E7 dac- amp to go with it. If i do this that means i will loose my sound card settings for gamer mode "sound blaster X-fi titanuim sound card". So if i use the E7 Dac it will bypass my sound card, so should i just get the E9 desktop amp or should i get a better sound card that has a built in dac and amp? Will just having the Fiio E9 amp work with my sound card or not? If i should get a new sound card what would you recommend?