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CPU: Intel Core i5-3570 3.4GHz Quad-Core Processor ($205.00 @ Canada Computers)
Motherboard: Asus P8B75-M/CSM Micro ATX LGA1155 Motherboard ($79.87 @ DirectCanada)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($52.99 @ Newegg Canada)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ NCIX)
Video Card: PowerColor Radeon HD 7950 3GB Video Card ($289.99 @ NCIX)
Case: Fractal Design Core 1000 USB 3.0 MicroATX Mid Tower Case ($39.99 @ NCIX)
Power Supply: Corsair CX 500W 80 PLUS Bronze Certified ATX12V Power Supply ($65.99 @ Newegg Canada)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($18.00 @ Vuugo)
Total: $811.82
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-05-27 04:40 EDT-0400)
I felt like making something a bit smaller than what I usually go for this time around, the case doesn't make it very upgradeable but you can always swap out the case quite easily. I went with a smaller micro atx mobo as well, mainly due to budget at first because going full ATX would have shot the price up another $10 off hand if I kept to your preferences without any real benefits unless you plan on expanding latter on. Going with just newegg and ncix it comes to $827, though if you expanded the list of part preferences and shopping retailers you can probably drive the cost down more as you have more parts to choose from.
Beyond that I tossed in a semi modular 80+ PSU to help keep the clutter down, and some ram which is nothing special but will get the job done. I tried to avoid mail in rebates so your dealing with just up front costs instead of dealing with the hassle of those.