For the mobo, I say get the Gigabyte UD3R or the Asus P5Q Pro. Both are amazing boards from what I've seen.
The Xigmatek will destroy the Freezer every day of the week, including Sundays.
Me an n-ster disagree about that Seagate drive. Access time is just too high and access time is more important than sequential reads, especially when both drives are really fast. The difference between the WD 640GB Blue and Black is negliable. The Black may be 10% faster and is definately louder. If it's a $5 difference, go for the black. Any more than that, I'd have to stick with the Blue. But either drive will be a good choice.
Video card doesn't matter much. HD 4350 or 94/9500GT on the low end. The 4670 and 9600GSO are both a step up if you want to possibly do some gaming. I'd suggest a passive card as some of these cheaper cards have small fans, which are pretty loud.
RAM doesn't matter much. Get any DDR2-800 4-4-4-12 or DDR2-1066 5-5-5-15. That gives you lots of head room for overclocking. DDR2-800 4-4-4-12 are capable of doing higher speeds, that's why they have tight timings. I'd expect these kits to reach DDR2-1000 no problems. DDR2-1066 is already at 533MHz, which is plenty for OCing. Brand doesn't matter much either. I like Corsair and Crucial. However, OCZ, Gskill and Kingston are perfectly acceptable as well.
There's something about the G31 chipset that bothers me but I can't remember what it is.
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If you're non-gaming, you don't need that much of a card. And, it's not that efficient.
I think he'll be much happier with Corsair PSU though