Hi,
[Budget] RM1500 - RM2000
[Purpose] Gaming (Dota2/CS Go/WoW) - not hardcore, just casual, Youtube, Browsing, Drama
[Hardwares that will be re-use] Dont know what are the current model i have for my hardware - Monitor, Mouse, Keyboard, Speakers, HDD 1TB,
[Games & softwares that use frequently] Google Chrome, Dota2, Spotify
[Personal preference] no preference as long as the desktop works.
Personally, I do not have any preference and knowledge about IT stuff, just need a decent PC for home use only.
I do not particular on very extreme graphic setup, however, average will do and I do not run multiple programme at a same time.
Please advise

Low budget rig suits you.
You may check out as it's sourced from IdealTech. I commonly use their specs to share because it's much convenient for references.