I suspect what your going to see is heavy cpu and ram usage.
If your going to be using one monitor the igp may work fine and you won't need a gpu at all.
Even with 2 monitors the igp may work fine.
You can always add a gpu latter if needed.
Change that dual rail psu to a single rail unit.
Change the ram to a 2x8GB@2666 kit.
I'm looking for a best hardware to work mainly in Excel with heavy spreadsheets.
This is what I would like to buy:
CPU: Intel Core i5-8600K 3.6GHz/8GT/s/9MB
Power: Chieftec A-135 APS-650SB
Motherboard: Gigabyte Z370 HD3
RAM: Crucial DDR4-2133 8192MB PC4-17000
GPU: msi GTX 970 4GB
+ SSD, HDD and other less important components.
What do you guys think about this hardware?