Check this crossfire-ready build:
PCPartPicker part list:
http://pcpartpicker.com/p/1NIyj
Price breakdown by merchant: http://pcpartpicker.com/p/1NIyj/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1NIyj/benchmarks/
CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($239.99 @ Newegg)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ Outlet PC)
Motherboard: Asus Maximus VI Hero ATX LGA1150 Motherboard ($192.99 @ NCIX US)
Memory: Corsair Vengeance LP 8GB (2 x 4GB) DDR3-1866 Memory ($64.99 @ Newegg)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk ($99.99 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($62.98 @ Outlet PC)
Video Card: PowerColor Radeon HD 7970 3GB Video Card ($279.99 @ Newegg)
Case: Corsair 500R White ATX Mid Tower Case ($79.99 @ Newegg)
Power Supply: Corsair Professional 850W 80 PLUS Gold Certified ATX12V / EPS12V Power Supply ($149.99 @ Amazon)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($18.49 @ Amazon)
Monitor: Asus VS239H-P 23.0" Monitor ($139.99 @ Newegg)
Total: $1341.37
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-10-12 00:19 EDT-0400)