For case cooling fans, here's what I recommend (these are other than the PSU fan of course)...
First, an intake on the front and exhaust on the back. This is the least you should have of an AMD system.
If you want/need more, one or two intakes on the side blowing on the cards, cpu, memory.
If you want/need more, an exhaust on the top (blowhole).
If you want/need more. More intakes on the front, exhaust on the back/top.
FYI, I've got an intake on the front, exhaust on the back, and 2 intakes on the side. This is for my 1.333 Tbird system.