New build - $1000 budget gaming/all-purpose PC

Approximate Purchase Date: This week

Budget Range: 1000 CAD Before tax

System Usage from Most to Least Important: Gaming, movies, internet

Parts Not Required: OS, keyboard, mouse, speakers, HDD. I have an extra 1 TB HDD 5900RPM external drive which I'm going to convert to an internal one and get a SSD for a boot drive, is that a good idea?

Preferred Website(s) for Parts: None, whatever gets me the best price. Not sure which Canadian websites are best. Also have Canada Computers and Tiger Direct stores close by if that saves on shipping.

Country: Canada

Parts Preferences: by brand or type: None

Overclocking: No, not sure if I need the performance for the added cost of upgrading processor, mobo and getting a cooler.

SLI or Crossfire: No

Monitor Resolution: Need a new one, looking at 21.5 inch at 1920x1080

Additional Comments: Which is a better option between a Gigabyte OC 7850 or Sapphire OC 7850? And any input is greatly appreciated, not the most informed and would love tips to improve performance/save money.

Here is the build I've put together http://pcpartpicker.com/ca/p/9L9P

PCPartPicker part list: http://pcpartpicker.com/ca/p/9L9P
Price breakdown by merchant: http://pcpartpicker.com/ca/p/9L9P/by_merchant/
Benchmarks: http://pcpartpicker.com/ca/p/9L9P/benchmarks/

CPU: Intel Core i5-2400 3.1GHz Quad-Core Processor ($189.99 @ Memory Express)
Motherboard: Gigabyte GA-P67X-UD3-B3 ATX LGA1155 Motherboard ($99.99 @ Canada Computers)
Memory: Mushkin Blackline 8GB (2 x 4GB) DDR3-1600 Memory ($44.99 @ NCIX)
Hard Drive: Crucial M4 128GB 2.5" Solid State Disk ($124.99 @ Newegg Canada)
Video Card: Gigabyte Radeon HD 7850 2GB Video Card ($249.99 @ Canada Computers)
Case: Cooler Master HAF 912 ATX Mid Tower Case ($59.98 @ NCIX)
Power Supply: Antec 550W ATX12V Power Supply ($64.34 @ Amazon Canada)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($20.99 @ Newegg Canada)
Monitor: Asus VE228H 21.5" Monitor ($134.99 @ Canada Computers)
Total: $990.25
(Prices include shipping and discounts when available.)
(Generated by PCPartPicker 2012-06-09 10:35 EDT-0400)