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I really miss Adobe Illustrator.)I didn't read all 7 pages leading up to this, so I may be repeating someone... even myself perhaps
Koolance makes a really cool 2 bay reservoir that can accommodate either one or two Lang D5 pumps. You can use one pump and combine the two resv's, or, you can use two pumps and have two separate resvs. I use it with 2, 1 loop for my CPU and 1 loop for my GPU
The Swiftech Apogee HD is hands down the most effective block I've ever used, and I've used many many many. It has 4 ports, you use two (in/out) for a traditional serial cooling loop, or, use all four in conjunction with their rad/res/pump combo that has 4 inlets/outlets so you can do parallel cooling. I've never been a big fan of swifty rads, but they work and Feser isn't making theirs anymore.
Do a google for a lightning full cover water block. I did last year for my 580 and found a group in Europe that was having them made especially for their group. About $200 bucks if I recall correctly, I didn't buy one (I strapped an LN2 pot on it instead
Danger Den tubing is awesome. Comes in sets with tubing, tube cutter, and matching color plastic clamps. Tubing bends and holds it's integrity better than any I've used before.
I use Koolance quick disconnects, I like the VL4N no spill ones. They work great most of the time, but I've had two fail on me over the past year or so. I still use them though because they are so handy, and, I have two of my big rads external and it helps to be able to disconnect them for moving etc.
Just saw Koolance has a new line of rads that look pretty decent. I have a dual XSPC that doesn't work for ____, so it's sitting in a drawer. Koolance rads are pretty good
Sounds like a nice rig you're putting together, just remember to test your loops for leaks with NO POWER to the board - use a spare PSU to run the pumps. No need for a 24 hour leak test like some say. If it's gonna leak, it'll leak within minutes not hours. Be careful bleeding your loops as I have friends who have lost motherboards bleeding their loops. I usually bleed mine through the reservoir, or, add an extra length of tubing and a Koolance Y connector to run a "breathing tube" to the upper back of the case... run the pump and the air goes to the highest point... use a fill port (like DD) to open/close it.
Good luck and post pics!