First thing I should Upgrade? Low Budget.

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Solution
The Apevia one is low-quality. The AZZA one is low-quality. The psu you currently have is low-quality. The Corsair CX is better than all of those, but it's still not even high quality. Remember, wattage isn't the one thing that determines a psu. It's all about the quality, as a low quality psu WILL fail on you and when it does, it will blow up and might destroy some components in your case.

That being said, this is a great high quality psu on a good price: http://us.ncix.com/products/?sku=59615&vpn=P1550SXXB9&manufacture=XFX&promoid=1307
It will allow for any upgrades you wish to add to your build.
Well the Reviews on that case is horrible most of the psus are broken on arrivavl mine however wans't and the peoples who wasnt said it stopped working after 2.5 months? I have a old dell thats psu lasts longer than that used for years