$550cad is a bit thin. Its $100 just for Windows.
Try -
CPU: AMD A8-6600K 3.9GHz Quad-Core Processor ($104.98 @ Newegg Canada)
Motherboard: Asus A88X-PRO ATX FM2+ Motherboard ($119.99 @ Canada Computers)
Memory: G.Skill Ripjaws X Series 4GB (2 x 2GB) DDR3-1600 Memory ($45.97 @ DirectCanada)
Storage: Seagate Barracuda 250GB 3.5" 7200RPM Internal Hard Drive ($67.98 @ Newegg Canada)
Case: NZXT Source 210 (White) ATX Mid Tower Case ($64.98 @ Newegg Canada)
Power Supply: SeaSonic 300W 80+ Bronze Certified ATX Power Supply ($59.98 @ Newegg Canada)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($99.79 @ DirectCanada)
Total: $563.67