Why not just buy a Danner Mag Drive Model 3?
Around $45, with 1/2" NPT thread fitting. All you need to do is buy a pair of 1/2" tail to 1/2" NPT barbs, screw them on, and you're done.
The pump you're looking at is WAY over-powered for your needs. It'd be putting more heat into your water than your entire computer.
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