I'd avoid using nickel if you're hell bent on EK, go no nickel.
if you're hell bent on it, get Optimus or HeatKiller nickel blocks, so the finish will last a little while. (they're also better performing products, they're both top tier for the industry on all CPU series)
i'd also NOT use EK coolant. They stopped Rebranding Mayhems coolant, and have had a ton of issues ever since(we see it ALL the time here). Best bet Mayhems X1(V2/Eco) or Mayhems Biocide+ inhibitor+
I appreciate your attempt for a full EK system, but it'll come at the cost of total possible performance.
Better radiators = Hardware Labs SR2
I'd also recommend going with EK's dual D5 pump based on the size of your loop.
another recommendation for all your pumps/LEDs, fans etc. Aquacompunter OCTO = full RGB control, pump control, fan control, curve control, monitoring, etc in one piece of software with vastly superior programming & functionality to iCue, Commander, motherboard level solutions, MSI Sync, and all the other Big Box Gamer Gear brand companies. aquacomputer also makes REALLY good blocks, like optimus & Heatkiller.
OCTO = for fans pumps & LEDs via Aquasuite
High Flow Sensor & temp sensor in one.
Add me on Steam, same name
R.I.P. Zawarudo, may you OC angels' wings in heaven.
If something appears too good to be true, it probably is.