I had this system set-up in a Cosmos 1000 case and had 8 120mm fans including one right behind the 570's but still temps Idled in the 50's and loaded in the low 80's. I tried replacing the heat sink compound to ICD but only down about 3 degrees so I started looking around at new cases. I looked at the HAF,Cosair 800 D, and a few other ones could not make a chioce then last month Maxium PC had an article on the Falcon Pc and in the article it stated that the case was an improved RV01 they changed a few things, but that the vertical mounting of the GPU's worked well. So I order one and set it up and the temps idle at 37 bottom and 38 top will post loaded temps shortly. All I can say is anyone want to buy a Cosmos 1000.
Here are a few Pics
 
 I changed the 180mm fan right under the cards to the new one they have out SST-AP181. It channels air instead of just moving it around and it works great.
 
Scores:
3Dmark11
P9798
X3489
 
3DmarkVantage
P41306
 
Unigine Heaven 2.5
Stock Setting
81.9
2064
 
Xtreme
45.7
1152
 

I always steered clear of cases like these because of where the ports are located. I always feared it would look like crap, but they did a good job hiding the cables on this case. Nice build.