I only see this thread now for the first time . Very nice setup you're planning. The best there is essentially as of now and you'll be very pleased. I know because I currently own it as well but with 3 rads instead of 2. I use the SR2 rads which are awesome not only because of their silence and cooling but also because of the 8 ports which allow you easier building and planning drain/fill ports. You will LOVE that particular feature !
Believe it or not but in addition I have a same setup in another location since 2 weeks now but with 1 radiator less and it makes a difference. After measuring and comparing my 2 rigs I now have to respectfully disagree with
on the theory that the front rad's warmed air makes it nearly useless. Quite the contrary, a bit more delta on air in the case going through the top rad doesn't seem to make much difference at all but the extra fan space makes all the difference because it simply allows the heat to be removed faster from more rad surface keeping temps down and therefore allowing you to run the fan speed lower. So I have to advise maximizing rad space to the max your case can take. You're looking at 600-700W peaks for your setup when all is eventually overclocked and running at full load.
Just like you I'm a big fan of silence and measuring everything digitally to have control and overview of my system as well as to learn and get 'feeling' with my hardware and testing/measuring the little differences. I achieved all my goals in the first mentioned build here with the 3 rads.
In order to measure not only flow but also water temperature digitally I use the following flow meter and love it since it only requires an internal USB connector and power connector (no dedicated temp/flow meter connectors needed on your motherboard) and comes with its own solid software to display readings and also keep logs over time:
another reason to chose this flow meter is that this component is made to allow high flow, not restricting it too much. Remember from your basic fluidomechanica lessons in highschool that a single most restrictive component (e.g a restrictive filter or flow meter) in a closed fluid loop determines the resulting flow and can bring it down. Same goes for the SR2 rads btw. They are also optimized for high flow.
Combining 3 SR2 rads, this flow meter, a gpu block, cpu block, mobo vrm integrated block, a bunch of QDC's which make your life 10 times easier on maintenance, I still can run everything off 1 single EK D5 pump at around 90% pwm capacity with a resulting 120 l/h flow. I don't hear the pump in the case under those circumstances. D5 is very quiet and awesomely strong. Dual pump makes sense since it would allow you to run them at much lower than 90% of max RPM and add redundancy in case one fails. I'm considering that option myself for a future upgrade but for now I've been doing successfully without.
As fan controller I use Corsair Commander Pro because it also allows me to monitor and control not only the fans digitally but also the Corsair AX1200i psu, including graphs over time.
You'll run out of internal USB connectors very fast as mobo's nowadays typically only have one on board and my setup needs 5 in total in order to connect everything. The corsair Commander Pro already has 2 integrated USB connnectors so it acts like a mini hub and to add another 3 I use this:
This setup has been successfully running for over 2.5 years now with dual Titan X (Pascal) in SLI and now since a few weeks I replaced both Titans with a single 2080ti.
Good luck and have fun building since the building itself of a machine like this is an awesome experience and I'm sure you'll run into many little unforeseen challenges to overcome !
my first tip for you: order your case first (separately) and start measuring everything inside the empty case (rad space, tube connectors etc) before you order the actual parts