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One of the problems you have is those fans you have littered throughout your pc. I had the exact same ones. They're useless. I can blow my nose and generate more forceful airflow than those things. Put a filter in front of them and they are completely. useless.
Say I swapped out all my fans for 5 noctua 140mm along with adding in the refurb h100 I've ordered I'm still going to need to space the cards out more?
Also what about replacing thermal paste on the cards?
Hadn't checked out the 3000rpm industrial fans. Each one moves three times as much air as mine! That has to be worth a shot. With going from 3 120mm fans to 2 140mm I'd double my airflow from the front. Then another 140 for the rear and a couple 120s for the h100. Even going this and the motherboard will be cheaper than a water loop and less hassle than that or the aio gpu coolers.
3000rpm fans will be loud!
Which ones did you get LtMatt and what are you using them for?
Now that you can't get Gentle Typhoons it's always handy to know of some good static pressure fans.
Seeing as you have a 3770K you have PCIE3, even X4 will not harm your FPS.
I can't find the data right now but someone has the link around here.
edit: found it: http://www.techpowerup.com/reviews/Intel/Ivy_Bridge_PCI-Express_Scaling/15.html
Been running with modified volts over the last few weeks and I must say, the results are quite impressive. With -100AUX and -31 on the Core Voltage, streaming the Tennis is sitting around 68c. Before applying this profile it was 85-89c which is quite high.
Very impressed indeed.