Since they have no info on the case and its clearance above the cpu it is going to be hard to recommended a cooler. That case also looks like it has almost no ventilation and a 7950 is going to need a lot of air to cool it.
I would look for a inexpensive case also. Then it will be much easier to find a cooler that will fit. You also will need to know what memory you plan to use since some coolers have clearance issues with the memory.