You're going to need a heavy pump to do all that in series. I would run it like this...
res > pump > rad(see below) > CPU > NB/GPU(parallel) then use the HD to balance the flow between branches.
As for the radiators, I would run them in parallel in order to maximize flow. But there is still so much debate PvS(Parallel vs. Serial) I'd say go with what works best for you.
A little info on head. Its not the height of the loop but the dirrerence between the intake and exaust. I could have a loop that went 50ft high and then came back to pump level with a 5ft head pump because the weight of the water falling equalizes the weight of the water rising. So its good practice to make sure the return to your res is below water level(not necessarily below pump intake though) to make sure the head is 0 for the pump. This makes sure the only resistance the pump has is that of the blocks on tubing.
As for choosing a pump. If you have acces to any pump(with a curve) test your setup and measure the flow. Find the corresponding head on the chart. You can take this head to the curves for the listed pumps and then find one with the amount of flow you want at that head.
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