I'm looking to possibly upgrade from my HD 555 since I've had this set of headphones for over 5 years and I feel like maybe it is time to change.   Are the Philips Fidelio X1 a good upgrade from the HD 555? I will use them primarily for PC gaming and music.   Would they need to be driven by...

I have been an owner of a pair of HD 555s for over 5 years, and I am looking for an upgrade.   I use my headphones for both gaming and music. What I want from the gaming aspect of it is a fantastic sound stage that sounds like surround sound (ex. Razer Tiamat). I want to be able to hear...