Well im pretty sure my case is going to be hotter than your standard consumer case, the space for airflow just isn't there. Not only that but il but pulling air through a 360 rad meaning it will be heated as it enters the case anyways. This is where the idea of using the two 120mm fans up top as intake fans came in. There is a large 140mm grill on the side of the case that allows the sideways mounted psu to vent. I figure that if I force enough air in the case I can get it to force the air out. But I can see where you are coming from, Chances are I will just go back to my previous setup with the three rad fans as intake and the two top mounted fans as exhaust. The fans I have are rated for like 110cfm or something like that il probably run them a little slower on the rad tho so I dont saturate the case with warm air.
If you can imagine how much (or little) airflow my case will have as its only 17.5"h x 6.25"d x 15"l and its made of 1/8 3003 aluminum sheet, so the internal dims are a little smaller and its going to be packed pretty full with a full atx board, 2gpus, 360rad, pump, resi, and tubes.