I appreciate that, I purchased a soundblaster z on my last pc and it was defective on arrival and I had a bad taste in my mouth thereafter with the company. I would consider purchasing one again but if I could find another option I would rather. Also, what about a dac and amp, no good for gaming?
If you get a sound card that will output virtual surround over optical (like the Z or Omni), you can get an optical DAC and an Amp. That's what I use when I game on the PC. Be aware that the DAC in the Z is actually not that bad so getting something cheap like the Modi isn't really going to improve your sound. So either get something more expensive or skip the DAC and just get a nice amp.
Someone else will need to chime in on the options from Asus that will output processed surround over optical.