Your goals are not as initially stated then. Your radiator is not especially well suited to the task of silence or absolute top performance. It IS suited to being the size of a BIX. If you have $1100 to spend on H2O, perhaps start with a case sized to fit a larger radiator? The Becooling 12x5 with turbulators inside is the best choice for low flow rate, low airflow cooling. Barring that, a heatercore will do much better with quieter fans due to its much larger surface area. The BIX has fairly dense fins and is relatively small for a heat exchanger. You will need a somewhat noisy fan to get decent performance from it (I think HWLabs recommends 100CFM).
No such thing as a free ride; the parameters are size, noise, and performance, and they are all related.
If I were building a super quiet system, I would use either the Becooling 12x5 with 2 120mm Panaflo L1A fans (on a potentiometer for adjusting) or a heatercore with a single 172mm fan (24V and undervolted to 7-12V). In both cases, a 1" shroud minimum.
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