Need Help choosing a cooler for my CPU

[PCPartPicker part list](http://pcpartpicker.com/p/1lpEA) / [Price breakdown by merchant](http://pcpartpicker.com/p/1lpEA/by_merchant/) / [Benchmarks](http://pcpartpicker.com/p/1lpEA/benchmarks/)

Type|Item|Price
:----|:----|:----
**CPU** | [AMD FX-8350 4.0GHz 8-Core Processor](http://pcpartpicker.com/part/amd-cpu-fd8350frhkbox) | Purchased For $0.00
**Motherboard** | [Gigabyte GA-990FXA-UD5 ATX AM3+ Motherboard](http://pcpartpicker.com/part/gigabyte-motherboard-ga990fxaud5) | Purchased For $0.00
**Memory** | [Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory](http://pcpartpicker.com/part/corsair-memory-cmz8gx3m2a1600c9r) | Purchased For $0.00
**Video Card** | [Sapphire Radeon HD 7970 GHz Edition 3GB Video Card](http://pcpartpicker.com/part/sapphire-video-card-100351vxsr) | $429.99 @ Newegg
**Case** | [Thermaltake VN300M1W2N ATX Full Tower Case](http://pcpartpicker.com/part/thermaltake-case-vn300m1w2n) | Purchased For $0.00
**Power Supply** | [Kingwin Lazer 1000W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply](http://pcpartpicker.com/part/kingwin-power-supply-lz1000) | Purchased For $0.00
**Optical Drive** | [LG GH24NS95 DVD/CD Writer](http://pcpartpicker.com/part/lg-optical-drive-gh24ns95) | Purchased For $0.00
**Operating System** | [Microsoft Windows 7 Professional SP1 (OEM) (64-bit)](http://pcpartpicker.com/part/microsoft-os-fqc04649) | $124.00 @ Amazon
| | **Total**
| Prices include shipping, taxes, and discounts when available. | $573.99
| Generated by PCPartPicker 2013-07-27 22:14 EDT-0400 |


this is my part list, I plan on over clocking my CPU and cant figure out what PCU cooler i should buy, i would like to keep it cheap (under $50) but if i need to i can spend $100 can someone help me out please?