I'd suggest forgetting the harddrives just as Airspirit said. I'd also do away with the micro and airplex rads.
Get a larger heater core & use dual 120mm fans on it, could also use a Hydor L30 pump. The Hydor is smaller and a bit better pushing pressure than a Ehiem 1250. It is also said to be extremly quiet.
Then add a top blow hole exhaust to aid the single 80mm you have.
Would cost a ton less money, and perform pretty well.
And as Airspirit also said your hard drives will be well cooled from such a high air flow without water cooling.
And it will be quieter with:
1 less pump
2 fewer fans on rads, and one less fan total
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