ASRock’s 939NF4G-SATA2 motherboard does a lot of the work for you, if you are shopping for a value system.  On board  nForce 410MCP audio, a built-in Geforce 6100 and ethernet as well means that just picking up a CPU and some memory is all you need to get an upgrade running.  You could also build a complete system from scratch just by adding a case with a PSU, a SATA harddrive, and a monitor to the list. PC Stats has the full story.
“The socket 939 ASRock 939NF4G-SATA2 motherboard supports all current 939-pin AMD Athlon64/FX/X2 processors, and is based upon the value oriented nVidia Geforce 6100 Northbridge and nForce 410MCP Southbridge. Most notably though, the Geforce 6100 incorporates Geforce 6-series integrated graphics which are accessible by a 15-pin Analog VGA jack at the rear I/O.”

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