Help with NAS, Personal Web Server, FTP, Video Streaming Linux Build

APPROXIMATE PURCHASE DATE:
January 2010.

BUDGET RANGE:
Preferably under $1000 (but I'm flexible).

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT:
Network attached storage, FTP server, web server (apache, php, ruby), streaming HD video content, torrents.

PARTS NOT REQUIRED:
Keyboard, mouse, monitor, speakers.

PREFERRED WEBSITE(S) FOR PARTS:
No preference.

COUNTRY OF ORIGIN:
United States.

OVERCLOCKING:
Probably not, maybe underclocking?

SLI / CROSSFIRE:
Not necessary.

MONITOR RESOLUTION:
No preference. It could be headless, although I wouldn't mind a monitor.

OVERVIEW:
I'm looking to build a machine that can easily handle serving NAS content (including streaming HD video), running a FTP server for my friends and clients, running apache for low traffic personal websites, handling torrents, etc.

LINUX:
I'll be running linux. I prefer Ubuntu or Gentoo, but I'm flexible. I was briefly looking into FreeNAS but I'm not sure it has all the features I'd like to use.

RAID:
I'm planning to use 4 SATA 1/1.5/2 terabyte hard drives with RAID 1 or 5. I like the WD Caviar Green drives, but I'm not sure if I'll run into performance issues for streaming video or compatibility issues with certain RAID configuration.

I'm also not sure if I will need / want a PCI RAID card or if some motherboards can handle RAID fine without a PCI card. Will a PCI card help enhance power efficiency since the processor gets a break?

SEMI-GREEN:
I'd like to keep the power draw as low as possible without experiencing any performance bottlenecks for the services I'll be using.

Performance vs power draw is where I need the most help. I'm not sure how fast this server will need to be, whether I'll want dual core or if I can get away with a low watt single core, etc.

I would even consider one of the newer Atom processors / motherboards if it's recommended.

STARTING POINT:
I've built a lot of mainstream computers but I don't know where to start for a low power / decent performance home server. I was considering the following components, but I'm very open for suggestions:

CASES:
The smaller the better.

* Antec Mini P180 Black Steel MicroATX Mini Tower Computer Case

PROCESSORS:
Low power as possible without sacrificing performance. Some ideas I have are below. I would even consider a lower watt processor if it's recommended.

* Intel Celeron 430 Conroe-L 1.8GHz 512KB L2 Cache LGA 775 35W Single-Core Processor
* Intel Celeron E3200 Wolfdale 2.4GHz 1MB L2 Cache LGA 775 65W Dual-Core Processor
* AMD Athlon II X2 250 Regor 3.0GHz 2 x 1MB L2 Cache Socket AM3 65W Dual-Core Processor

MOTHERBOARD:
I'd like suggestions. Features such as LAN-wake, virtualization, gigabyte ethernet, and solid on-board graphics would be nice.

RAM:
I'd like more than enough RAM. Probably 2 or 4 Gigs. I assume I probably won't need ECC memory, but I would consider it.

PSU:
I want a top quality PSU. I believe this is not a good place to cut corners.

VIDEO CARD:
I'll probably stick with the motherboard's on-board video.

ETHERNET:
I assume I'll need gigabyte ethernet.

Decide on the form factor before picking out a cpu. None of your listed usage requires a full-blown AM3/775/1156 cpu. You don't do transcoding. Atom would fit your usage nicely. 38W tops under load.

http://www.silentpcreview.com/article987-page4.html

For comparison, the X3 720 @ 1.6Ghz undervolted with C&Q off, it's at 66W under load.

http://www.silentpcreview.com/article1003-page6.html

Yes, you could replace the X3 720 95W with a Sempron 45W and the total power consumption under load will be lower. I can't find the article, but it's in the 50-ish watts tops.

http://www.newegg.com/Product/Prod [...] 6819103189