buy a cheap cpu and then a better when i get more money?

Seek54

Reputable
Jul 31, 2016
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Hello, I was wondering if its worth to buy a build like this and then upgrade the cpu (and buy a cooler later)?
Motherboard: ASUS STRIX Z270E GAMING 215,99 €
CPU: Intel Core i3-7100 (then upgrade to a i7-7700k later?) 117,90 €
RAM: G.SKILL TridentZ 16GB 3200MHz 157,99 €

Maybe I should choose other parts? Suggest. (I'm not sure on the CPU and RAM yet, I will be upgrading the CPU so I don't want to spend too much).

I buy the RAM from here (same as other parts):
https://www.varle.lt/atmintys-ram/?sort=&f.s-tipas=DDR4&f.s-talpa=16 sorry its not in English. I'm buying from here because the shop is pretty near me and cheaper then other retail shops, price is kinda high tho.
I'd also like some suggestions for a CPU cooler without RAM clearance issues (preferably air) and a case with a window and rubber grommets.
Thanks a lot.