Update: Please refer to our 2013 Motherboard Buyer's Guide for updated information.
Scoping out parts for a new system is an exciting time: Everything's shiny, fast, and thoroughly disgraces the previous build's specs for the same (or less) investment. The CPU should be an easy choice - grab something that makes sense for the budget and the utilization of the PC, then move on. It's often a toss-up between two different CPUs, but once that's decided, it's smooth sailing. Sort of.