I have 2 power color radeon hd 7770 cards with crossfire x enabled ( no overclocking) and my computer has frozen 3 times now because of heat. It has been hitting aorund 100-105 degrees when running darksiders and Borderlands I have standard liquid cooling and 120 mm fan.
Other specs: intel i7 970 6 core (no overclocking)
If you haven't added any fans to the case there are lots of places to add them and the more the better. There is a place for two in the front , one on the side and one on the top. So I would get two 120mm fans and one 140mm fan with the 140mm for the top.
There are precut holes for fan placement in that case and there is no need to get another case just some fans which is a lot less work and cost. You could also pick up a fan controller so you can adjust the fan speeds manualy or automaticly.
there is a side intake on that case slap a 120mm fan on it and you will be fine also you can adjust for fan speed on your video cards so they dont peak as quick. i had to 4850's cf'ed and never had any dramas and they ran way hotter and i had a shitty case with a side intake and a heavily overclocked c2q
I guess it's up to the OP as to which way he wants to go and it was only a sugestion but it doesn't mean he has to go with everything. He doesn't have to get the fan controller or all those fans , he can just add a fan or two but at least he's now aware of what that case has for options and if he wants to take everything out of that case and put it in a new one then he certianly can.