The Realtek ALC887 on the MSI ITX I linked is really meh for audio. You could always buy a sound card, but remember the MSI board only has a PCI Express 2 x16 so I think you would have to get a PCIe sound card.
As for the video I have not had a chance to personally take mine for any laps, but here's this:
Link to review/article
The Graphics capability
Tagged and labeled under the Vision engine there's a nice graphics subsystem embedded into the APU responsible for many tasks, embedded is a Radeon HD 6310 (Vancouver Radeon HD series 6000) which can drive real low-level games, but most of all is perfect for Full HD content playback, DXVA hardware acceleration and post processing. You guys all know UVD right, the Universal Video Decoder technology from ATI, well the 3rd generation UVD core logic has been embedded into the GPU so VC1. H.264, DIVX/XVID acceleration is all supported.
Here's the conclusion for the MSI ITX from another article: link
On 1080p playback: link to Youtube
The Asrock a75m-ITX comes with a Realtek ALC892 audio. While the 892 is a step above the 887's audio (the MSI ITX) the audio (as far as I know) isn't great either way and you may be interested in buying a audio card anyways. Both the Asrock and the E350IA-E45 have a single PCI Express x16 so you would have to buy a PCIe card for either one.
Because you're concerned about audio I would look at the Asus Xonar DX
. It all depends how much you have to spend. If you're working on a budget the MSI would be good, especially if you were to buy a sound card with it.Edited by Asininity - 4/9/12 at 9:55am