So I found some ram sticks I think im gonna go for, the Corsair Vengeance RGB PRO DDR4 3600MHz 16GB.
Im sticking with the MSI B550 unless some other good board shows up with a good offer.
And of course the 5800X, cuz its about the only good AMD in stock where I live.
Now, the cooler. Yes I could keep the AIO, I guess it will perform OK, only drawback is the pump noise tho. Could eventually just upgrade it later.
BUT: I got it mounted to my Intel, and all the parts I got with it is thrown away.