Quick question about fans and radiator. My goal is a quiet water cooling system that can stand up to serious overclocking. Silence being the first objective. I have read the pros and cons about using the fan in a push or pull configuration. Since i want silence, i'll need a fan that offers very low db and since i want to do some serious overclocking... the fan needs to really move air.... But
I have not found any resonably priced fans that have both qualities.

So comes my question:

Use 2 fans in push and pull configuration. Does this double the rated CFM per fan. Does it also double the noise? E.g. 1 fan = 45cfm at 21db... x2 = 90cfm at 42db?

Get a bigger radiator?

Go passive, e.g. rocket from thermaltake or the reserator?

Thanks in advance