A chiller won't be more efficient than a rad and therefore won't be quieter. You'd need some major peltier wattage to cool a tbird with a chiller for starts, that means major air sinks which means major airflow - not good for quiet. For a quiet setup have a decent rad and run the fans at 5V or 7V. You want to fit the largest fans you can and run them slow - I run a single 172mm fan and it's pretty quiet at 100cfm, less noisy than my disks.
As for reducing the res size, just buy a smaller one.
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