Budget video editing/gaming PC build

After the Ivy bridge release, I tried making the best build for under 850$.


Approximate Purchase Date: Summer

Budget Range: 750-850

System Usage from Most to Least Important: Video editing, Aftereffects-ing, gaming

Parts Not Required: Display, keyboard, mouse.

Preferred Website(s) for Parts: newegg.ca, directcanada.com

Country: canada

Parts Preferences: intel processor

Overclocking: maybe

SLI or Crossfire:Maybe

Monitor Resolution: 1920x1080

CPU: Intel Core i5-3570K Ivy Bridge 3.4GHz (3.8GHz Turbo) LGA 1155 77W

GPU:XFX Radeon HD 6850 Fansink 775MHZ 1GB 4.0GHZ GDDR5 2XDVI Display Port HDMI PCI-E Video Card

Motherboard: MSI Z77A-G45 ATX LGA1155 Z77 DDR3 3PCI-E16 4PCI-E1 SLI SATA3 DVI HDMI VGA DX11 USB3.0 Motherboard

PSU: Antec High Current Gamer 750W 24PIN ATX12V V2.3 Active PFC 80 Plus Bronze SLI Power Supply 135mm Fan

Case: Antec Three Hundred Two Mid Tower Gaming Case 302 ATX 3X5.25 6X3.5INT No PS Front USB3.0 & Audio

SSD: Mushkin Chronos 120GB 2.5IN SATA3 Sandforce SF-2281 SSD Solid State Disk Flash Drive

RAM: Mushkin Enhanced Blackline 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model 996995

I already have an external 2tb hard drive