Maybe I missed it but are you putting the rads on top or in the
front and back? I think with the horizontal MB there's not
much room on top.
So if you have the nine fans coming in through the rads
and then nine on top exhausting you should be fine. I haven't
seen your top panel so I'm guessing which one you have.
I used the lamptron fan atic controller. You can put three
fans per channel I believe but I only put two. All my rad
fans were always one speed.