You could take a look at the next,
PCPartPicker part list:
http://ca.pcpartpicker.com/p/23Exn
Price breakdown by merchant: http://ca.pcpartpicker.com/p/23Exn/by_merchant/
Benchmarks: http://ca.pcpartpicker.com/p/23Exn/benchmarks/
CPU: AMD FX-8320 3.5GHz 8-Core Processor ($156.98 @ Amazon Canada)
CPU Cooler: Zalman CNPS10X OPTIMA CPU Cooler ($9.99 @ NCIX)
Motherboard: ASRock 970 Extreme3 R2.0 ATX AM3+ Motherboard ($65.00 @ Vuugo)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($70.98 @ Amazon Canada)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($62.95 @ Vuugo)
Video Card: Gigabyte Radeon R9 280X 3GB Video Card ($299.99 @ NCIX)
Case: Antec Three Hundred Two ATX Mid Tower Case ($49.99 @ Memory Express)
Power Supply: Antec High Current Gamer 620W 80+ Bronze Certified Semi-Modular ATX Power Supply ($49.99 @ Canada Computers)
Optical Drive: LG GH24NS95 DVD/CD Writer ($17.00 @ Vuugo)
Total: $782.87
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-17 07:37 EST-0500)
I would disregard canada computers,i don't know how they do that with their prices but they don't seem to be the same on their site.
You could also take a look at the next two items as replacement for what is in the list,
http://ca.pcpartpicker.com/part/antec-case-gx700
a very good case when it comes to cooling and sound,but quite ugly if you don't like that kind of style.
http://ca.pcpartpicker.com/part/cooler-master-cpu-cooler-rr212e20pkr2
a very good cooler for the price although the zalman for just $10 is hard to beat.