Building My Own: Recommended Components/Sources For These Goals?

As a small business, I need a PC at home that can do the following:
1) Run MS SQL Server and have memory and power to crunch a huge amount of data.
2) Be backed up and have some kind of RAID to prevent corruption.
3) Be cost effective.
4) DVD writer.
5) Don't need a monitor or software.

I have a need for no more than 200 gigs. I have built machines before but mostly for the goals of GAMING - thus I typically mimick the components found on Toms Hardware and surf for the best prices from pricewatch after checking the vendor out at resellerratings.

If someone here can spec out a good machine for me and maybe clue me on some of the lower price sources, I'd appreciate it. My budget is around $1000 - which, for a business machine, will get me very far, no?

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Look at my recommendation in this question (it includes prices):
You can bump up the RAM to 4GB, and get a cheaper video card.

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Just a thought, but is MS SQL Server multi-threaded? If so, a dual core CPU should give you significantly more crunching power,
but may well break the budget. If it's something that is too expensive now but still desirable, a suitable motherboard with socket
939 for Athlon 64 or socket 940 for Opteron can facilitate a dual core processor in the future as a drop-in replacement. Make
sure the PSU has some reserve on the (1st) 12V rail for that as well.

Also, the nForce4 based boards (which make up the majority of socket 939 boards) have RAID capabilities (but generally not
RAID 5), and seem best prepared for the new revision E processors and dual core X2's as well (most will need a BIOS update).

Lastly, I suspect that hard drives with NCQ support would be beneficial.

These are just some things to think about, I'm not very experienced in building servers like this.

Forgot to include this, it offers some insight in the performance benefit you might expect:

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