I've finally decided to go with water cooling

[Makymaco]

What I was talking about, is if I don't screw up and the pump fails because it was defective, and as a result damages my system.

Take a pump with a rpm cable. PLug it on your motherboard and monitor the rpm. Shutdown automatically your pc by software if no rpm detected.
You can also put two pump in series, if one fail the other is here (it is the solution i use)

Is anyone willing to actually sit down and answer my questions and help me?

ask your questions and be patient