As almost all current consumer grade motherboards, including the one you've selected, includes relatively good audio. Whether you need a discrete soundcard is a different matter.
Most people don't.
Try it first. If you find the sound not adequate, get a discrete sound card. Assuming you have good speakers to actually tell the difference.
Just as an aside:
The PSU is a bit overkill
The RAM is a bit overkill unless you really, really need 16GB
The case....well *I* wouldn't spend that much for something that sits under my desk and I never see