Need help with cooling 600t, new SLI 770 setup needs it's heat managed better.

So, I've had the same build since June 2012, and recently had to RMA my GTX 680, they replaced it with a 770, so I decided to invest the $400 and go SLI. Heat is now an issue, as the old card was reference and had a better external exhaust than the current 2 cards.



Case: Corsair 600t

CPU: i7-3930k @ 4.25ghz OC

Fans: Stock 200mm intake, front - Stock 200mm Exhaust, top.

CPU Cooler: Corsair H60, Push/Pull 120mm Radiator Exhaust, rear.

GPUs: 2x EVGA GTX 770 SC 4gb w/ ACX Cooler. (Currently sit around 75-80c under load)



I'm looking at replacing the two 200mm fans with Cooler Master Megaflow 200mm's.



COOLER MASTER 200mm MEGAFLOW



Push/Pull radiator fans for rear exhaust.



CORSAIR SP120





OPTIONAL:



Upgrading the H60, to an H100i, and going two of the 120 Corsair sp120 exhaust top.



I'm just not that experienced with the ideal pressures needed for a system, my rig was running pretty well for stock fans, so I never bothered to change it.