Are you shopping in pounds or dollars?
The case looks to me like an excellent choice.
Bust your budget if you need to for a case you love.
Cases will be with you for a long time.
The 275R comes with one 120mm fan which I would mount in the rear as exhaust.
I would buy two 140mm front intake fans. 140mm fans move more air at lower rpm.
You can buy them for $10 or so.
For $15, I would buy top quality noctua units:
Here is the 1500 rpm unit:
https://www.newegg.com/p/N82E16835608065
1200 rpm is the same price, but I figure you can slow down 1500, but not speed up 1200.
Noctua usually includes low noise adapters, but I do not know if these units include them.
Love the blower gpu coolers.
They get air directly out of the case.
GTX1070 is entirely appropriate for a 9600K.
In time, the 9600K can support an even stronger gpu.
For a cpu cooler, there are three noctua units.
NH-U12s @ $60
NH-U14s @ $70
NH-D15s @ $80
Any one of them will do the job.
I have no idea how much difference the $10 price difference between them means to your budget.
Corsair VS units are considered tier 5/6 on this quality list:
Credit to @Starelementpokeand @Energycore for helping out with this long-awaited refresh of the old PSU tier list by Aniallation (who previously went several months without logging in), leaving the old list in need of help. This is simply an update of the list that was flawed in creation by the P...
linustechtips.com
They are not dangerous units, but are prone to failure.
Corsair has a good RMA process if you should need it.
The GTX1070 will run on a quality 500psu. even a RTX2080 will run on a 550w psu.
Nothing wrong with overprovisioning with a 650w psu, it will only use what is demanded of it, regardless of the max capability.
I would try to buy a 550w Seasonic focus gold for $80.
This time of year, Seasonic has sales so look for them.
https://www.newegg.com/seasonic-focus-550-gold-ssr-550fm-550w/p/N82E16817151203
It has a 7 year warranty.
The psu is the one item you should not go cheap on.
The descriptor "suitable for gaming" is pure marketing junk.
A psu works or it doesn't.
Where else might you save?
1. Any Z390 motherboard will do the job. Consider the smaller M-ATX format with only 4 expansion slots.
Here is one for $115:
https://www.newegg.com/p/N82E16813157858
2. A Samsung 256gb m.2 nvme device will be cheaper@$75.
I like Samsung evo best for performance and reliability
https://www.newegg.com/samsung-970-evo-plus-250gb/p/N82E16820147741
The 500gb unit is still less at $90
https://www.newegg.com/samsung-970-evo-500gb/p/N82E16820147690
The vengeance 3000 ram is a nice pick @$75
https://www.newegg.com/corsair-16gb-288-pin-ddr4-sdram/p/N82E16820233852