CPU+Mobo: Asrock H110M HDV + I3 6100 ($266)
RAM: Kingston ValueRam 8gb ($76)
Storage: WD 1TB Blue ($72)
Graphic: Palit GTX1060 3GB Dual Fan ($315)
Power: FSP 550W 80+ Hexa Plus ($68)
Casing: Tecware F3 Gaming Case ($49)
OS : Windows 10 64bit ($30)
Total: $876 (Excluding SSD, Monitor, Wireless Adapter, WIFI Extender, Keyboard, Mouse)
Remaining money let u choose between upgrade to i5 6500 or buy ssd

CS:GO might need i5 for better fps since is a slightly bigger multiplayer game, dota no problem. SSD u can get any 240gb SSD at about $100 or so, can load OS games everything so that it boots much faster. Choose one.
As with everything do remember to ask for discounts and check your items before u leave!