Nice build for a budget of your type, however i think a R9 270(x) would be a better substitute than a 750Ti. Also a less expensive motherboard will provide roughly the same experience but the ud3p is a great choice for a budget mobo. This would be better performance on same budget: (And yes you will need a WiFi Card unless its near your router.) PCPartPicker part list:
http://pcpartpicker.com/p/tGfYhM
Price breakdown by merchant: http://pcpartpicker.com/p/tGfYhM/by_merchant/
CPU: AMD FX-8320 3.5GHz 8-Core Processor ($135.00 @ Newegg)
Motherboard: ASRock 970 Extreme3 R2.0 ATX AM3+ Motherboard ($59.99 @ Micro Center)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($64.98 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($48.88 @ OutletPC)
Video Card: MSI Radeon R9 270X 2GB TWIN FROZR Video Card ($159.99 @ Newegg)
Case: Cooler Master HAF 912 ATX Mid Tower Case ($42.99 @ Micro Center)
Power Supply: EVGA 500W 80+ Bronze Certified ATX Power Supply ($29.99 @ Micro Center)
Total: $541.82
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-01-31 17:11 EST-0500