New build, any advice (Canada)

Solution
well, here is my fix for you

ram
gpu
psu
add CPU cooler - you can buy it later though

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($236.98 @ Newegg Canada)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($31.06 @ DirectCanada)
Motherboard: ASRock Z87 Extreme3 ATX LGA1150 Motherboard ($139.50 @ Vuugo)
Memory: Patriot Viper 3 8GB (2 x 4GB) DDR3-1866 Memory ($64.30 @ Amazon Canada)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($64.79 @ DirectCanada)
Video Card: Gigabyte Radeon HD 7950 3GB...
well, here is my fix for you

ram
gpu
psu
add CPU cooler - you can buy it later though

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($236.98 @ Newegg Canada)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($31.06 @ DirectCanada)
Motherboard: ASRock Z87 Extreme3 ATX LGA1150 Motherboard ($139.50 @ Vuugo)
Memory: Patriot Viper 3 8GB (2 x 4GB) DDR3-1866 Memory ($64.30 @ Amazon Canada)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($64.79 @ DirectCanada)
Video Card: Gigabyte Radeon HD 7950 3GB Video Card ($224.99 @ Memory Express)
Wireless Network Adapter: TP-Link TL-WDN3200 802.11a/b/g/n USB 2.0 Wi-Fi Adapter ($26.99 @ DirectCanada)
Case: Corsair Carbide Series 300R Windowed ATX Mid Tower Case ($81.79 @ DirectCanada)
Power Supply: Antec High Current Gamer 620W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($59.99 @ Canada Computers)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($107.33 @ Newegg Canada)
Total: $1037.72
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-28 11:07 EDT-0400)
 
Solution
First, I wouldn't get a USB Wifi, I'd get a PCI-express one. Bigger antenna and generally I find they work and connect better than a little a USB stick. Plus the USB sticks always get knocked and broken off inside the ports. As a tech, I see it lots.

You could drop your case and PSU down to save some money. All comes down to how much you want a fancy case to look at your video card through the window with and you how much you want to save $50 and get a $30 case instead of an $80 case.