i5 9600k

Hello, I am assembling new PC. I have a choice between i5-9600 Tray (does not come in a box and without, just a CPU, no stock cooler) and AMD Ryzen 5 3600 boxed. There is a $20 difference between them so I am more likely to go with i5-9600KF but since it requires cooler, I will pay a bit more...

Well, I've got a 4th gen i7 4790k with 32GB of DDR3 RAM. MSI Z97 Gaming 5 Mobo and an MSI GeForce GTX 1070 Gaming 8G GPU. I have a Corsair HX 850 Modular PSU. So I have $1,200 to spend. I'd like to get the i7 9700k, but I don't think I can afford it. I'm Ok with that since the 2nd choice is...