The fan controller came up but the fans did not and the fan controller is a good one. The one thing that you want to consider is noise level , those 200mm and 230mm fans do not make a lot of noise , they push the air but they are pretty quiet. I have the HAF-X and it has 2 of the 200mm and 1 of the 230mm and I actually prefer them to the 120 and 140. You can stay with those big fans and they will cool the case just fine , the main job of the case fans is to keep the ambient temp inside the case cool and lots of fresh air for the fans on the devices.
A 120mm fan will have to spin a lot faster and thus make more noise to push the amount of air those big fans do. You will find out that the only thing that your adding to the case is noise by thaking two out and putting six in. You can still get the fan controller to use for those big fans. My case stays just fine with the 230mm , two 200mm and the rear 140mm.