Cooling for a CiT Vantage case

[Buenos1980]

Hey I am a beginner in the world of cooling and am looking to put some better cooling into the following to enable me to overclock - unfortunately it seems that my case may not be the most roomy and not really looking to replace it what would be the simplest and hopefully cheapest way to cool?

Cit Vantage Blue case
Intel I5 4670K Haswell (GFX 3.40Ghz)
Asus 1150 Z87-K x 1
24X DVD Writer x 1
Corsair CX600 600w Power Supply
1tb Sata Hard Drive x 1
8gb Corsair Vengeance 1866mhz Pro
Nvidia GTX 760 2gb x 1

 

[clutchc]

Is this the case? http://www.amazon.co.uk/CiT-Vantage-Gaming-Audio-Reader/dp/B0071KZNUY
If so, it looks like it already has a front fan and t side fans. With the addition of a rear fan, you should have all the air flow you need.