For Gold Psu price below 180 sgd, few choices Superflower Leadex II (Warranty 5 years Techdynamic), Seasonic focus plus series (Warranty 10 years Corbell), Evga G+ series (Warranty 10 years Tech dynamic), Evga G3 (Warranty 10 years Tech dynamic), Coolermaster V series (Warranty 7 year ban leong). Corsair RMx series (warranty 10 convergence)
Dont cheap out on your power supply, if your cpu is the brain, the psu is the heart. A cheap one can fry your entire system. Also with long warranties and PSU standard not changing much you can keep it for years without changing a new one.
Here are the review for some of them:
Evga G3 750
http://www.jonnyguru.com/modules.php?name=NDReviews&file=print&reid=500
Evga G+ 750
http://www.jonnyguru.com/modules.php?name=NDReviews&file=print&reid=555
Seasonic focus plus 550
http://www.jonnyguru.com/modules.php?name=NDReviews&file=print&reid=529
Coolermaster V650
https://www.techpowerup.com/reviews/CoolerMaster/V650/
Corsair Rm650x
https://www.tomshardware.com/reviews/corsair-rm650x-psu,4611.html
Superflower leadex II 750
https://www.techpowerup.com/reviews/SuperFlower/SF-750F14EG/
I only recommend Tier 1 or 2 gold fully modular psu for its long warrranty and reliability also better cable management. If these cost too much and you only need bronze try getting a bronze psu from Seasonic M12II series which is also in tier 2.