TR's November 2007 system guide
 

Deciding when to pull the trigger on a new PC isn't easy, since new technology is always waiting just around the corner to spoil the party. As soon as you build a system, something shiny and new will arrive that offers higher performance and gee-whiz new features at the same price or less. This is the way of all things in the PC industry, and it's a very healthy dynamic.

http://techreport.com/articles.x/13660