I use headphones only. I posted the current pair (HPA2) and potential future updates (SS Siberia v2) because my current pair is getting worn out.
I should have said "Is it justifiable to spend ~$75.99 on a sound card if I'm using HPA2s or Siberia V2s?"
If those aren't sufficient... Does one need to spend ~$180+ for headphones/headsets to hear a significant difference in sound quality in higher bit rate music and games from a dedicated vs onboard audio chip?