Use a xeon with 12 threads instead of an i7. The one I used in my build has an OK clock speed, and I liquid cooled it.
PCPartPicker part list:
http://pcpartpicker.com/p/XTDdwP
Price breakdown by merchant: http://pcpartpicker.com/p/XTDdwP/by_merchant/
CPU: Intel Xeon E5-1650 V2 3.5GHz 6-Core OEM/Tray Processor ($651.48 @ Mwave)
CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler ($89.99 @ Amazon)
Motherboard: ASRock X79 Extreme4 ATX LGA2011 Motherboard ($260.49 @ Amazon)
Memory: Kingston HyperX Beast 32GB (4 x 8GB) DDR3-1866 Memory ($281.74 @ Amazon)
Storage: Samsung 850 EVO-Series 250GB 2.5" Solid State Drive ($114.99 @ Amazon)
Video Card: Asus GeForce GTX 980 4GB STRIX Video Card ($544.99 @ NCIX US)
Case: NZXT S340 (White) ATX Mid Tower Case ($69.99 @ Amazon)
Power Supply: EVGA SuperNOVA NEX 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($85.98 @ Newegg)
Total: $2099.65
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-03-10 09:46 EDT-0400