If you're not going overboard on peripherals (just cheapish keyboard and decent mouse and you want high end I'd go for an AMD build.
Motherboard: Gigabyte 970A-D3P $135ish
CPU: FX-8350 $269ish
GPU: R9 380 $250ish (I'm not sure about the price of this GPU, where I live it comes out to around 300 USD but it's definitely cheaper in the states)
RAM: 8GB HyperX Fury $80ish
Just get a case with a decent enough PSU, there are some good ones out there for cheapish, let's say. $100 to be safe.
This'll bring you to around $900, all thats left is monitor and peripherals, which you definitely don't need to go overboard with.
These are pretty gouged prices, electronics are pretty expensive where I live. I guarantee you can find them cheaper in Canada.
This build should do just about anything you really need at decent settings and FPS although you might want a better cooler as the FX series run fairly hot due to the shitty default cooler.