Hi, I want to custom PC for gaming but I'm not sure whats the best spec for it, please help me~

Software: Unreal Engine / Constant / Maya/ Adobe Photoshop and etc / Z-brush / Crazy-Bump / Substance Painter and also have some games(etc dota, LOL, castle crashes).

Budget: RM7000 (include monitor, mouse, keyboard) *if can i hope i can get lower budget then that

Brands: HP / Dell or etc (except for Lenovo)

Thank You.