Let's not forget that a large frontal area allows a thicker radiator without impeding airflow any more than a smaller rad. The lower air velocity helps noise too.
The question boils down to how much airflow you genuinely need. For systems which emphasize low noise over low temperature, this is probably a lot less than you expect. How much heat will go into the WC system? What other components (e.g. PSU) will set the noise floor?
My experience says that adding cooling is tremendously easier than reducing noise. I'd suggest starting with 1 Nexus 120 at ~7V. You'll have <20cfm, but the fan should be inaudible except in unusually quiet rooms. Should the cooling prove inadequate, you can always raise the voltage and/or add a second fan.
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