If you are building a media PC then the only thing that matters is if you want 5.1, 7.1, optical, coaxial, etc for connection to your Receiver.
Most motherboard manufacturers use the same audio chipset (Realtek) and they all just vary mostly by 5.1, 7.1 setups.
As for sound they all sound the same, I have an HTOmega Claro which honestly I can't tell the difference between one or the other, the Audio tuner is really what matters for sound quality assuming your using Coax or SPDIF connections.