Some advice for a first timer

So I have the essentials down, but I need some advice when it comes to wireless adapters. For my current PC, I have a Belkin N300 USB adapter and it's really bad, so I was wondering if someone could suggest a PCIe adapter or something of the sorts. Also, do I go with Windows 8 or stick with 7? This would be for both gaming to everyday computer "stuff"

PCPartPicker part list: http://pcpartpicker.com/p/o92N
Price breakdown by merchant: http://pcpartpicker.com/p/o92N/by_merchant/
Benchmarks: http://pcpartpicker.com/p/o92N/benchmarks/

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($229.99 @ Newegg)
Motherboard: MSI Z77A-GD65 ATX LGA1155 Motherboard ($167.86 @ Newegg)
Memory: G.Skill Ripjaws Series 16GB (4 x 4GB) DDR3-1600 Memory ($74.99 @ Newegg)
Storage: Western Digital Caviar Black 1TB 3.5" 7200RPM Internal Hard Drive ($109.99 @ Newegg)
Video Card: EVGA GeForce GTX 670 2GB Video Card ($389.99 @ Newegg)
Case: Corsair 400R ATX Mid Tower Case ($109.98 @ Newegg)
Power Supply: Corsair Enthusiast 850W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($129.99 @ Newegg)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($19.99 @ Newegg)
Monitor: Asus VH236H 23.0" Monitor ($149.99 @ Newegg)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($99.99 @ Newegg)
Keyboard: Razer BlackWidow Ultimate Wired Gaming Keyboard
Mouse: Razer RZ01-00780100-R3U1 Wired Laser Mouse ($74.99 @ Newegg)
Total: $1542.75

Thanks,
NTQ