Depending on how tall your CPU Cooler is, you may of may not have room for a large side fan. But, the side fan location seems to be pretty low, so a 2 120mm fan setup should be fine. You might want to buy it, and then determine if you have room for a 200mm side fan.
Also, since you are not water cooling, I would place 2 120mm fans on top to let the heat rise out.
List:
● Top: 2 120mm fans
● Front: 200mm fan
● Rear: 120mm fan
● Side: 2 120mm fan
This should provide plenty of cooling for overclocking and sli.