The 18W DDC would be better for high restriction loops more head and it will flow as well or better...It just costs a little more...
Most ram blocks are 1/4" in the inside of the block so whether its 1/2" or 1/4" tubing going to it the flow will be killed.HDD blocks are the same...Putting a pump after it will not help..In other words everything will be bottle-necked by the smallest components.. You are going to kill your temp's by adding ram and HDD there is no way around it..If you put all that in the same loop your CPU temp's are going to be crap...The only way around it is by running two separate loops...
Is it really worth it...It would be to me..I have a 480 GTX....The GTS would be a better rad and is about the same price....120x38mm fans have a higher air pressure and I feel they scavenge air through the rad better...
So no matter what, keep the hdds and RAM out of the CPU/GPU loop. Also I have heard some people say they put a radiator inbetween the GPUS and get roughly 5C cooling rather than put a radiator between the CPU and GPUs.
I thought the GTX was the improved version of the GTS?
So here is my thoughts now:
Loop1: (3/8" tubing)
Loop2: (1/4" tubing / Bling Factor)
Any reason to put a second pump in the primary loop for redundancy incase the primary pump fails? Will the second pump be able to push water through the first pump if it does fail?
Also I am assuming my 1000W PSU should be able to handle all of this?