Bakayar�

I run an Xonar DG personally. I was lacking audio outputs, and had some interference issues. Picked one up for cheap, and solved all my issues. The built in amplifier helps to drive Beyerdynamic DT 990 Pro, while removing the pesky interference I had.

Asus Xonar DG -> Behringer MA400 -> DT 990 Pro Enjoying it a fair amount, especially for the low budget point. I think spending anymore would only get me dimminishing returns in terms of audio quality to price ratio.