Your set up looks pretty good, I think you could change your CPU and GPU though, if your main focus is gaming. I'm in the same boat as you ATM (building first rig) and mine is mainly for gaming; if yours is too, you may wan to swap the i7 for the i5-2500K (from what I read is the best CPU for...
So my budget for this build after tax is about $750 CAN (about $664 before tax) after rebates and I think I have a fairly good choice of parts, but as this is my first build I'm still a little unsure in some areas. Also I already have an hard and optical drive, and all other peripherals so those...