We changed the recommended CPU for the $250 upgrade and $500 computer from a Socket 775 CPU to a Socket 1155 Pentium G850.  This brings even the basic computer up to a point where in the future you could upgrade to a quad core, Core i7 CPU.  The motherboard and RAM changed as well to accommodation the CPU change.   The rest of the changes were to replace discontinued models and the usual price changes, mostly down.

You can find the main Parts Lists page here. http://www.homepcbuilder.com/build-your-own-computer-parts-lists.html