I'd reccomend going Res>Pump>Pump>Rad>CPU>GPU/NB(parallel)>Res.
A res works best just before a pump as it allows the pump a relatively unrestricted source of water. The 2 pumps in series will give you the best flow overall flowrate. Place the radiator after the pumps to dissapate the heat the 2 pumps will add. I'd go with the GPU/NB in parrallel simply because neither really needs much cooling. Theres no point in cooling the water a second time inbetween the CPU and NB/GPU as the difference in coolant temp is minimal and both the GPU and NB can handle the slightly higher temp.
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CPU: Barton2500 @ 2.43 ghz
MB: NF7S Rev2
RAM: 2x 256mb Kingston HyperX 3500
HD's: 2x 160gb SATA RAID
GPU: Sapphire X800Pro VIVO -> XT Plat(softmod) 520/590
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