Actually, finally realized the design problem with both Cougar and Fractal Design cases. They leave too little space on top so if you have mount the 240mm radiator on top for either of them, it will hit the top of the motherboard. For Fractal Design, if radiator or fans was too thick, top of the motherboard will be in the way. And for Cougar, same thing, so that was pretty much why it only says 120mm radiator for the top.
However, if you want to go with the Cougar case, it will definitely depends on if it will fit the space you want, you might want to go with MX410 series instead. Supposedly, it was a little wider, but shorter in height and length for whatever reason. But it stated support for 240mm radiator, though you might need to consider changing to thinner fans. It says “maximum component height on motherboard is 40mm”, but probably meant maximum allowable height between motherboard and case is 40mm. It does only allow 300mm for video card though. Price-wise on Newegg is about the same between MX331 and MX410.
Or you can consider the DarkBlader X5., but that one is significantly wider and longer.
As someone that do have and still use couple of the Cougar cases, got them cheap when Tigerdirect was still somewhat relevant, their cases were fairly light for steel cases, but that was because the panels were fairly thin and internal was a little thin too. Then again, those were the cheap cases, not too picky, as long as they can get the job done.
Cases are still best to choose in person, too bad not too many computer stores anymore…