good psu and room in it for crossfire if you want.
good starting point for gaming and video editing. theres room to up/downgrade from here depending on your budget or specific preferences.
PCPartPicker part list:
http://pcpartpicker.com/p/21pM5
Price breakdown by merchant: http://pcpartpicker.com/p/21pM5/by_merchant/
Benchmarks: http://pcpartpicker.com/p/21pM5/benchmarks/
CPU: Intel Xeon E3-1245 V3 3.4GHz Quad-Core Processor ($279.99 @ Newegg)
Motherboard: Asus GRYPHON Z87 Micro ATX LGA1150 Motherboard ($159.99 @ NCIX US)
Memory: G.Skill Ares Series 16GB (2 x 8GB) DDR3-1866 Memory ($119.00 @ Newegg)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk ($99.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($69.99 @ Newegg)
Video Card: PowerColor Radeon R9 290 4GB Video Card ($404.98 @ SuperBiiz)
Case: Fractal Design Arc Mini MicroATX Mini Tower Case ($69.98 @ OutletPC)
Power Supply: SeaSonic M12II 850W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($99.99 @ Newegg)
Optical Drive: LG GH24NS95 DVD/CD Writer ($15.00 @ Newegg)
Total: $1303.91
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-12 18:39 EST-0500)