I have been contemplating building something very similar myself. I will primarily be used for audio work, although I can't really call it "Pro" audio as I will be using a Hercules GTXP card. The GTXP is not a pro audio level card by any means, but for simple recording and editing the crystal chips in these seem fairly clean. I have a couple 1.4ghz Tbirds sitting around here so I was considering going the AMD route. I will primarily be using Sound Forge 5.0.
The AMD760MPX chipset boards look to be the best choice right now, and all have four DDR slots. They have the same limitation of the original 760 chipset that if more than two dimm slots are filled you are supposed to use Registered DDR. It may be possible to run unregistered, but you may run into problems. The board I have been leaning to is the Asus A7M266-D. It looks pretty nice, has a good layout, and even has overclocking options. I was also planning on picking up a couple 60gb Maxtor ATA133 drives and a Promise Fasttrack 133 card to run them in RAID 0. When working with large 1gb+ .wav files, RAID 0 offeres a very nice speed boost. The board also come with a USB 2.0 card bundled and onboard Cmedia 6 channel sound, not that you would be using that. Anyway, here is a link to the board..
Asus A7M266-D
Also, just noticed that they say a CPU throttling mechanism is on the board to prevent overheat..looks interesting.
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