Amazon is selling the unlocked Intel Core i7-875K Processor for just $329.99 shipped, originally priced at $387.12. This processor “has an unlocked multiplier, which allows you to easily increase the core and memory frequencies beyond the original specifications.” Product page. Video after the break.
When combined with a robust motherboard, good cooling, and high-performance DDR3 memory based on Intel Extreme Memory Profiles (Intel XMP), you have the most flexibility for overclocking available. Even without overclocking, the cores run at 2.93 GHz, guaranteeing enough processing power for demanding applications.