DO NOT buy a cheap psu.
Coolermaster quality is variable, but for $15, it can't be very good.
A cheap PSU will be made of substandard components. It will not have safety and overload protections.
If it fails under load, it can destroy anything it is connected to.
It will deliver advertised power only at room temperatures, not at higher temperatures found when installed in a case.
The wattage will be delivered on the 3 and 5v rails, not on the 12v rails where modern parts
like the CPU and Graphics cards need it. What power is delivered may fluctuate and cause instability
issues that are hard to diagnose.
The fan will need to spin up higher to cool it, making it noisy.
A cheap PSU can become very expensive. Do not buy one.
Buy no less than a tier3 unit from a list such as this:
http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html
Seasonic is good and often sells for less worldwide.
And, consider a stronger psu to allow for a future graphics card upgrade. Perhaps the 550w area.
It will only use the wattage demanded of it, regardless of the max capability.
If your budget issue is severe, and perhaps temporary, consider eliminating the GT1030 and using the integrated HD610 graphics for starters.
You will then get a better idea of what you need for YOUR games. A G4560 is good enough to play games with much stronger graphics cards.
The word is out that the G4560 is an outstanding budget processor. For that reason, retailers are asking a price premium for it.
You may find that the G4600 sells for nearly the same price and has an even stronger HD630 graphics included.