My friend is moving to a new office job where he won't be allowed to install any additional software/drivers and in a clean desk environment. As such, he is looking for the best DAC/Amp that can be plugged straight into and powered from a PC and able to operate without drivers. I had the...

Hi guys, I'm looking for a cheaper DAC/Amp solution (doesn't have to be single piece) for my office. My budget is probably around $250-300 (including shipping to Australia). I may get something better eventually, but for now, since it's only for office use, I don't need anything too powerful...