I don't think you will need to overclock with a cpu that powerful. Plus 16gb ram is better for the newer games (better safe than sorry)
INTEL CORE I5 6600 -RM 949
Use the stock heatsink -rm0
ASROCK Z170 Pro 4 -RM 548
16GB value ram DDR4 2133mhz -RM 299
PALIT GTX 1070 GameRock -RM 2099
Seasonic S12II-620 EVO -RM 299
Sharkoon DG7000 (RED) -RM 269
SAMSUNG 750 EVO 120GB -RM 229
WD 2TB Caviar Blue -RM299
Total RM4991
With this,you should only need to upgrade the graphic card every two years (if you are planning to stay in 2k resolution) and psu every 4 years (just in case for bigger,hungrier graphic cards of the future)
I'll bet the cpu can stay strong for 4 years.