My TB 1200MHz runs at about 60°C all the time, no problems. I'm currently using the GlobalWin FOP-32i as cooler, however, I just ordered a Swiftech MC370-0A. Keep in mind that, when comparing temperatures, you should only compare them with measurements done on the same type/revision of a mainboard. Also keep in mind that, e.g. with the AsusProbe program, the program gives a different reading compared to the bios or SiSoft Sandra reading. The AsusProbe program gives a CALIBRATED temperature that is higher than the bios measurement. Of course one tends to believe the lower temp...
<i><font color=purple>Running within specs is the key to a stable computer!</font color=purple></i>