I currently have the Xonar DG and wish that I didn't.
The author of the linux driver, Clemens Ladisch, has stated that there's simply no support for anything other than audio output. http://www.alsa-project.org/main/index.php/Matrix:Vendor-Asus, http://www.alsa-project.org/main/index.php/User:ClemensLadisch
So! I am looking for a soundcard whose audio (output and mic) work both on the back panel AND on the front panel of the desktop. If you're running Mint 14 Cinnamon x64 and both your back panel and front panel work (for output and micropohone), please comment and tell me what soundcard you're using.