The FiiO (E07K?) won't have any surround sound, but apart from that it is nice DAC/amp.
Asus U3, U7, Essence STU would be for surround sound on laptops. The U7 and Essence STU will have decent amp/dacs.
FiiO E07K would be for an stereo DAC/amp for PC.
DSS/Mixamp would be for a surround sound on consoles.
Edited by chicolom - 5/27/13 at 2:08pm