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.
I thought originally I was seeing a post from a few years ago?!
'I' wouldn't define any LGA 775 as 'great' for Multimedia, it's adequate. To get quality audio you'd need either a case that supports 'HD Audio', S/PDIF add-on card, or an older PCI sound card. Depending on your CPU/GPU Blu-Ray 'may' be a problem.