Considering the money you guys had left over, I am dumbfounded why you didn't get a better case.
Looking around on frozencpu.com, $500 will get you a "complete" high-end water cooling system - that is, 120mm x 3 radiator, reservoir, fans, fan guards, shrouds, CPU block, pump, two GPU blocks, NB/SB chipset block, hoses, hose clamps, attachments, etc.. - and still stay within your $4000 budget.
Being the true enthusiast, if I am buying a striker extreme for $300, a G0 QX6850 for $1050, and two video cards for $1000, it would be silly not to spend a few hundred more on a well-planned, high-performance water cooling system that keeps ALL OF THEM COOL. The additional time it takes to set up and install will most likely pay off big dividends down the road when I overclock.
On Newegg.com $249 will get you a Lian-Li PC-V2000Aplus II full tower case, with room for all your water cooling gear AND PSU. Sure, it doesn't come with a dual 120mm radiator, but choosing a case just because it HAS a dual 120mm radiator is like choosing a car just because it's got navigation and 20" wheels - in other words, the enthusiast will get around it and can do it himself.
EDIT: Even cheaper, for $200 is the Lian-Li PC-G70B with even more room inside.
In fact, $160 will get you the Swiftech H2O-120 compact CPU liquid cooling kit, with the CPU block/pump in one unit and the radiator/reservoir in a second unit. Easy to mount, performs well, and completely usable in ANY case you like with a 120mm fan mount on it. Invest $90 more and you can pick up the Apex Ultra kit with full-flow 1/2" ID tubing, dual 120mm radiator, and a radbox mount that attaches to any case with any size fan hole.
There is a difference between the enthusiast, who will plan his build and get the most out of his gear, and the guy who just picks stuff off newegg.com and puts it together. Anybody can slap gear in a case and hit the power button, but it takes the enthusiast to look at every component, every sub-component, plan his build, research benchmarks, compare prices, make sure they work together, fit the right accessories to get the most performance, and most importantly, devote the time to get this all done.
This is not to criticize your builds here in the article or the work of your team in any manner, you have all done a great job. But it seems your objective is more "what can I buy off the shelf and quickly slap together for $4000" as opposed to "how would an enthusiast spend $4000".
I guess enthusiasts have more time to spend, whereas editors must meet strict deadlines.