Got interested in watercooling about 8 years ago, planned many times to build a system and never did it. I never found the components I would like to have and building them on my own would have costed a fortune.
I did not want to overclock my system, did no want to make it look cool on the inside, just wanted the most quiet possible system at a good speed with best possible cooling.
Well never did it because it is simply stupid to have the whole system quiet and still have either a pump ticking or the sound of HDD.
Best solution would have been sumbmerging the whole thing in oil
Today the main aspect is not the cooling solution anymore, power efficiency has become an aspect the day the GPUs started consuming more power than the rest of the system. One could build an absolutly perfect cooling by simply using an old fridge or using a completely passive heat exchaning system, but who does really want to pay about 2k just for power consumption every year ?