B&H Photo: Apple Mac Pro for $2599
See review of the 2013 Apple Mac Pro.
Apple Mac Pro Quad-Core $2599 (instant savings of $400). AppleCare at B&H is also discounted substantially over the Apple Store price. AppleCare for 2013 Mac Pro.
The CPU in the 2013 Mac Pro can be upgraded after the fact, and thus it is a solid investment to start with—many users will find 4 cores more than adequate.