OCIA.net has posted their Budget System Building Guide. Below is a direct quote from the guide:
"For that very reason, we started writing these System Buying Guides a few years back. We have three categories of Buying Guides: Budget, Mainstream and Performance. Our Budget Guide has a spending limit of $600, the Mainstream limit is $1,200 and we allocate $2,400 for our Performance Guide. The systems that we piece together here are designed to give you the best overall experience under the given budget."