Here is the best value build IMO! Also it stays under you budget, and the gtx660 is definitely better than the 750ti. Thanks and good luck!
http://ca.pcpartpicker.com/p/H4d88d
AMD FX-6300 3.5GHz 6-Core Processor $119.99 NCIX
CPU Cooler
Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler $29.79 DirectCanada
Motherboard
ASRock 970 Extreme3 ATX AM3+ Motherboard $89.99 NCIX
Memory
Kingston Black Series 8GB (2 x 4GB) DDR3-1600 Memory $79.99 Memory Express
Remove
Storage
Seagate Barracuda 500GB 3.5" 7200RPM Internal Hard Drive $49.79 DirectCanada
Video Card
Gigabyte GeForce GTX 660 2GB Video Card $189.99 Memory Express
Case
Thermaltake VL80001W2Z ATX Mid Tower Case $42.99 Canada Computers
Power Supply
Corsair CX 430W 80+ Bronze Certified Semi-Modular ATX Power Supply 59.99$
FINALLY THIS IS GONNA BE AN ABSOLUTELY BEAUTIFUL BUILD!!! ALL BLACK