IF you want your custom pc to run games consistently, I would suggest you consider a 2nd hand gpu into your budget, example a Sapphire RX580 8gb is running around MYR500 for 2nd hand if you are able to find one, 2nd regarding about motherboard, I personally dont care about what model is my motherboard as long as it comes from a reputable company and the motherboard is the size to your liking then it should be no problem, unless you want to overclock then a higer tier motherboard is recommended, NEVER EVER BUY A PSU THAT COMES WITH A CASE ! PSU is the most essential 1st stage for saving all your other custom pc compenent when there is unexpected power surge occur, we do not live in an ideal world where the power output is consistent and predictable, so NO never go cheap on your PSU, nowadays 550-650watt should be suffice to even play a AAA title games with no problem.