Whatever config you gonna choose from rads, i highly suggest to not sandwitch them. Just and only in separate mounting places with separate airflow intakes. (your mention of 3 fans after 2 rads made me believe that you wish to try rad sandwitch). Rad sandwitches are like high-fpi rads (_less_ effective then one normal rad at low to middle fan rpm-s, more with high rpm fans (but even with powerful fans - less effective then two separate airflow rads). I doubt 180mm fans being still quiet at high enough rpms too.