Is this enough

[Ziv972]

1440p 165hz for game like Overwatch and CS:GO

i7-7700K Kaby Lake Quad cor
1
MSI Z270 SLI Plus

ADATA 16GB (2x8GB) 288-Pin DDR4 2400Mhz CL16

ASUS GeForce GTX1070 ROG STRIX OC

Crucial 275GB - SATA3 6GB - 2.5 inch

NZXT NZXT Source 340 Glossy White

Corsair Hydro Series™ H100i v2 Extreme Performance Liquid CPU Cooler

Corsair Air Series AF140 LED White Quiet Edition High Airflow 140mm Fan

Corsair 120mm Air Series SP120 High Performance Edition High Static Pressure 120mm Fan

Corsair 550W RMx Series™ RM550x — 80PLUS® Gold Certified Fully Modular PSU

 

[SethJPC]

More than enough for CSGO
I'm not sure about Overwatch, its possible it could achieve consistent 144fps using lower settings.

 

[cisco001]

ditch 100i, get cheap cryorig. h7
ditch 1070, upgrade to 1080
possibly faster ram