I just recently aquired the same board and put it into my water cooled Coolermaster Cavalier.... I to found out that the northbridge gets UBER hot even in reasonably cool enviroments... I then pulled the system out of that case since it was modded to house the water cooling and put it into a Thermaltake Shark case... for cooling I have a Coolermaster GeminII (dual 120mm)
CPU cooler which has such a large footprint from the fans that it covers pretty much the entire top of the board blowing down over top of both the north and south bridge heatpipes... It seems to be doing a pretty good job and I am happy with it and the cooler is not to badly priced right now.. good luck.. I know it has to be hot where your at!!