So just as an experiment I put the Flirc Case with all 4 threads working on seti@home on top of my WHS homeserver. The case has a few 120mm quite 900rpm fans that exhaust the case heat up and out. So it isn't the coolest air, but just really to increase air movement. Just with doing that the temp went down to around 54~55 degrees.
The flirc case itself provides a great way to pull the heat off the cpu with a good amount of thermal capacity. Once that is done just a bit of air movement in the room around the case will probably be more then enough to meet anyones desires for cooling with that case.
I have been trying to wrap my head around a way t do some kind of forced air down directly on the cpu with a modified top to the case. This really highlights that probably isn't the way to go. Simply a way to push air up and around the case will pull the heat off more evenly. Something like a stand with a 120mm or 80mm fan it would probably be the perfect way to enhance the cooling for the Flirc case. But then that also kind of goes against what it's intended use case is though .