Papst makes a 120mm with 51CFM but only 29dba @12v, two of these in series push/pull would give only 32dba but still offer good cooling and at 7v I doubt you'd hear them. Depends on how much prformance you want with your quiet. A pair of Papst 120mm @75CFM in push pull would give more performance but at 41 dba @12v but turned down to 7v I bet they'd be around 35dba or less, not bad at all.
Another good site for quiet is silent pc see what their forums offer as well.
What 120mm fan did you use befor that was still loud at 7v?
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