I'm thinking of getting the AKG K701 headphones because there seems to be a consensus online that they are very good for gaming. There also seems to be a consensus, however, that they are very hard to drive, and they are not worth it without an amp. I currently have only an XFi Titanium Fatality sound card (the older one, not Titanium HD). What amp should I get? I don't want to lose surround sound emulation (from CMSS-3D or Dolby Headphones).