What fan should i use for for my case and overclocking

I plan on buying the NZXT Phantom - http://www.newegg.com/Product/Product.aspx?Item=N82E16811146067

which fan should i use for overclocking ? and also will there be enough space because i know it has 4 fans in it already.

My specs will be these or more less

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive
Storage: Samsung 830 Series 128GB 2.5" Solid State Disk
Power Supply: Antec High Current Gamer 620W 80 PLUS Bronze Certified ATX12V
Optical Drive: Samsung SH-222BB/BEBE DVD/CD Writer
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