Hey guys, need a rig recommendation. This will be my first rig. Already have a Dell 24" monitor, keyboard and mouse. I will be needing Windows.

Budget: <RM2k if possible, can go up to RM2.5k if absolutely necessary.
Usage: Dota 2 & CS (Max settings), HD movies (main usage), torrents, occasional CAD softwares, Microsoft Office, multitasking.
Requirements: Reliable and upgradable.

Thanks!