Yeah, I know it's a very old post. If someone is looking into this topic now, any way, at least they'll run into this thread and hopefully it gives them what their looking for.
For video content creation stick with those Mobos that offer 32GB of RAM. That's not where your attention needs to be focused. It should be on the video card. There are very expensive high powered video cards that are designed for video game fanatics in mind and then there are video cards infinitely more powerful (and way more expensive) designed for content creation professionals, video game designers, computer graphics artists , industrial engineers and scientists that want to render hypothetical models of super abstract ideas like fluid dynamics, fractal geometry or how regular 3D objects might appear if they existed in an 11th dimension higher frequency parallel universe.
Oh yeah, you can get a video card that can render lots of layers of timeline video at blinding speed (and play all those un-rendered layers back in real time) but you are really going to pay $$$$$$ for it!
You're attention is probably focused on the number of cores that the CPU (s) have doing the work for you - 4 cores, 8 cores and even 12 cores. Imagine if you had a minimum of 192 cores sharing that workload? That's what you would have if you got an nVidia Quadro 4000 but that card is just around $700.00. nVidia makes more powerful cards (with lots of GPU cores) for video content creation that start at the $ 2000.00 and up range with more cores sharing the work. It takes advantage of parallel processing technology called CUDA. There are probably other companies out there that offer CUDA based video cards too. Go on youtube and look up everything you can find on Quadro cards.
The only limitation is your budget and resourcefulness.
Check These videos out...
http://www.youtube.com/watch?v=uyjJRwlpC00
http://www.youtube.com/watch?v=xso6CGdsl2c