Bump, looking for answer.
Well, RAM is pretty much a commodity, and the distinctions among module/kit manufactures are the choice of "black parts."
Since it's a commodity, you won't find much in price differences between different manufacturers trying to meet the same spec.
The price will vary according to specification speed, tightness of spec latencies and voltage requirement. For overclocking, you may have better luck with fewer modules (for dual-channel, 2x8GB versus 4x4), but you've chosen the quad-channel route. I did some of my own investigations based on your initial post, and apparently there isn't a difference between the modules themselves across dual versus quad -- only the number sold as a kit and the manufacturer's assertion of "chosen specifically for quad-channel systems."
For those willing to overclock, there were some fairly inexpensive Samsung modules @ DDR-1600 with low spec voltage and good OC'ing potential -- no glitzy heat-spreaders.
I'd had some discussions with the tech-support at G.SKILL -- my preferred choice these days. It confirmed that you might find a lower-speed spec of RAM that runs at a higher OC with the settings of their high-end modules. You could conversely buy the high-end modules, UNDER-clock them, lower the voltage and tighten the latencies.
In your case, you might just as well get top end kits. But given the speed spec, look for lower spec voltage and tighter timings across different manufactures.
Especially, do your own "survey" of customer-reviews at sites like Newegg. Look for larger number of cus-reviews, and then the percentages of people who had "DOA" or "unable to run at full spec." Discard complaints of people who had problems for not tweaking their RAM manually beyond the XMP, auto and latency settings.
For G.SKILL's part, they are "all over" Newegg cus-reviews like flies on a dead bunny-rabbit -- always trying to assist buyers, offering exchanges and offering help in configuring the RAM.
Just surfing through the Newegg G.SKILL offerings, they have 32 GB 4x8GB kits of RipjawsX, RipjawsZ, Ares and Trident models rated at speeds from DDR3-2133 to DDR3-2400. But the voltage spec seems to be always around 1.60V. Other, similar modules may be rated at 1.65V. Last I heard, 1.65V was the upper safe limit. Maybe somebody with more recent info can tell you otherwise. The timings on these modules reflect the higher speeds.
So you could compare to slower RAM -- like my GBRL DDR3-1600's. You would certainly be able to run Ripjaws Z, Trident or Sniper modules rated at 2133 at 1866 or 1600 and tighten the timings while lowering the voltage.
Just as an example, I use two kits (for a dual-channel system) of four modules G.SKILL Ripjaws GBRL's. They're DDR3-1600's, latencies 9-9-9-24. I run them at DDR3-1866, 10-10-10-28 and CMD-1. The spec voltage is only 1.5V, and my OC'd modules are set at 1.52V -- which I believe is higher than it needs be if I'd been more careful and patient in testing.
But like I said: even with your high-end processor, mobo etc. -- a 1000% "thorough" HCI-Memtest pass will take you four days on 16GB. The maximum limit within warranty on these modules was either 1.6 or 1.65, while for purposes of Intel's CPU the recommendation was closer to 1.58V. You might want to investigate this latter item for your "-E" CPU.
Anyway, I'm happy with my own system and the RAM kits.
EDIT: Oh -- and on the monitors. You shouldn't have trouble configuring a triple monitor setup. I just ordered Laminar's X-Plane 10 flight sim program, and they promote just such an idea. Your best choices of monitors will have low response time in milliseconds, good quality control assessable through reviews first and cus-reviews second. Suggest you buy the same model and make for all three -- if that's the way you want to go. But do you have the desktop or other space that would make three monitors more convenient and less bothersome?