Which should I upgrade?

Jan 12, 2014
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So my specs right now is this:

Intel i5-2320 3.0GHz
Palit Gtx 750 2gb gddr5 StormX 128bit
AsusTEK p8h61-M LE
Emaxx 4Gb ram
Windows 7 32-bit
600w PSU PowerLogic(generic)
generic casing with 1 fan at side
Seagate Barracuda 7200.10 160Gbytes

What component do you think i should consider upgrading?
My budget is about 80$ or 3600 pesos (philippine peso)

Im also gonna do an upgrade from windows 7 32-bit to 64-bit.

Thanks!
 
About the Cooler Master, I can only get the Cooler Master hyper 212x.
Now i found a cheaper version that costs only about 10$? yeah 10$. Here's where I found it and buy my stuff: http://dynaquestpc.com/product/cooler-master-x-dream-i117-cpu-cooler/