Just wanted to report on my success on building a machine based on the DIY6 article. The only real deviation was the motherboard, since the P5K3 Deluxe is sorta difficult to get these days, probably because of it's age. I had 2 vendors initially backorder it, then tell me that it was no longer available. I finally decided to go with the Asus P5Q3 Deluxe and was able to use the DDR3 memory that was specified in the article. Being that we do Avid and After Effects as well as some 3D packages, I opted for the nVidia Quadro FX 3700. I also deviated on the case. Since we were nVidia based, I found the COOLER MASTER NV 690 NV-690C-KWN1-GP which has an nVidia color scheme and green interior lighting...very purty.
We've been running Avid Xpress Pro 5.8.4 for over a week non-stop, occasionally dropping out to After Effects CS3, and haven't had a single issue. Not one. I was soooo scared being that Avid software is notoriously picky about what it's being run on, but not this machine. We also haf Premiere Pro CS3 on it, but I've not done anything very heavty with that yet. The machine that this one replaced was a dual Xeon board with fans that sounded like a 747. This one barely purrs. Here are the specs for this build, in case anyone wants to duplicate it.
Asus P5K3 Deluxe WiFi Motherboard
Intel Core 2 Quad Q6600 Processor
PNY Quadro FX 3700
Corsair Dual Channel 4096MB PC10600 DDR3 1333MHz Memory
M-Audio Audiophile 2496 PCI Digital Audio Card
COOLER MASTER NV 690 NV-690C-KWN1-GP Black SECC/ ABS ATX Mid
Tower Computer Case
Plextor PX-820A DVD Super Multi Drive
ADS PYRO1394 Firewire card
Used our existing monitors...and without them the total cost was $2014.