This build is going to focus on these main aspects:
1. Durable work quality.
2. Powerful performance - Everything you need for a work center!
3. Easily Upgradeable if user(s) wish to play modern games. (Just for fun a 460GTX is 200$, this will allow you to play anything on the market.)
The Desktop: 
Antec New Solution VSK2450 Black ATX Mid Tower Computer Case 450W Power Supply - $79.99
ASUS M4A88TD-V EVO/USB3 AM3 AMD 880G SATA 6Gb/s USB 3.0 HDMI ATX AMD Motherboard -$107.99
AMD Phenom II X2 550 Black Edition Callisto 3.1GHz Socket AM3 80W Dual-Core Desktop Processor - $80.99
G.SKILL 2GB (2 x 1GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Dual Channel Kit Desktop Memory - $51.99
Western Digital Caviar Blue WD3200AAJS 320GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive - $47.99
ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner - $18.99
Desktop parts total: $317.94Extra Peripherals:
ASUS VW195TAA Black 19" 5ms Widescreen LCD Monitor 300 cd/m2 2000 :1 (ASCR) Built-in Speakers - $119.99
Wired Keyboard and mouse Logitech MK120 Black USB Wired Slim Desktop -$19.99
HP Deskjet F4480 CB745AB1H Up to 28 ppm 4800 x 1200 dpi InkJet MFC / All-In-One Color Printer -54.99$
Peripheral parts total: $194.97----------------------------------------
Subtotal: $582.91Tax: $48.09
Shipping: $27.69
----------------------------------------
Grand Total (as of 7/14/2010)
$658.69Closing notes: I am very impressed with some of the hardware that is out right now for this type of build. The processor is a really good find, and there is the possibility to unlock 1 or 2 of the disabled cores on it to make it a Quad Core CPU. The motherboard, unlike anything "cheap" from Intel supports SATA 6.0 and the new USB 3.0- this makes tremendous value because when these formats become standard, you wont have to upgrade as soon, saving you money in the long run. This build has the motherboard, power supply, and many more other components ready to take on a big gaming upgrade. How the powerful HD 4250 integrated graphics that come with the board should be plenty powerful for Windows 7, light gaming, smooth DVD playback, and more! You can also add 2 more 120mm intake fans that will greatly upgrade the thermal dynamics of the case later down the road. I think you should take note that while the Inter grated speakers that are built into the monitor will work fine, I will be honest and say that the sound quality is VERY poor. I recommend putting down 30 or 50$ down for a 2.1 audio system. You get much better control and clear deep sound. However, if you do not listen to music or movies much, this is not a critical component to worry about. In all, I am saving you about 300-500$ (rough estimate) in all for this whole package. This computer is a 100% unique custom built computer fine tuned for your application that cannot be found anywhere else! I spent a lot of time putting all this information together so I hope you will give me a call if you are interested!