2 fans in paralell is always perferable to 2 in serial. Serial fans double the effective airpressure generated, while paralell doubles actual flowrate. Unless your fans are practically stalled, serial fans won't even come close to doubling flow.
I'd say that idea is very good. It takes 8 80mm Panaflos to match the noise of a single 120mm L1a, meanwhile they would flow about 2.5x the air. So your setup will be quiet, assuming 2 24CFM L1As can flow enough.
Why is sucking preferable to blowing? Don't give the old excuse that car radiators suck, because they don't. They bothsuck and blow. Furthermore the fact that the fan is inside is unimportant, I would like to see howexactly you could mount a radiator fan out side of a car's radiator easily.
I'm not saying if sucking is worse then blowing, I have no reason to think so. But I would like a good reason to beleive there is even any difference between the 2.
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