Damocles...
That extra fan on the PS, in the LIAN Li pc60 case is just above the cpu on my asus cuv4x MB. I switched to a thermalright AK6 with the stock fan that came with it (i dont know the brand, but its very good), and now my CPU runs 1 degree C above the motherboard temp. And that temp is from both the asus probe software, AND SiSoft SANDRA. Currently on a normal day, without the a/c in my office, i'm running at 29 C (motherboard) and 30 C cpu. With SETI@home running for 30 minutes the max temp only reaches 33 C.
If your gonna O/C, this case and PS set up is gonna give u lots of room 🙂