ok well in your situation, if you dont want to OC too high i wouldn't spend anything yet.. stock fan will most likely do just fine at the very least to 3.2 maybe you could add one case fan for very cheap probably less than 10 dollars shipped, then you just screw it on and plug it on the asus board where their is 3 or 4 pins and says fan1 or fan2

but i dont see any reason why you cant OC now, i just personally wouldnt want to run a hot case for long periods of time has a small chance to cause a problem, sounds like all you need to do is get OC

heres tools youll want/ need

intelburn
http://downloads.guru3d.com/IntelBur....html#download

core temp
http://www.alcpu.com/CoreTemp/

CPUZ (already have)

heres where to start
first thing you must know is if anything goes wrong , which is to be expected, you may see blue screen, or may lock up... perfectly normal nothing is harmed, just reboot and the bios will automatically reset stock timings so you can boot again into bios..
hope you know how to get into bios... looking like this

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