If your peak CPU temp is 47C, this is actually very, very good and well below what most overclocking runs. Most norties are quite happy in the mid 50's so your 47C peak is ideal.
If this is your env/mobo temp, you should look into better case cooling to drop this a tad. It's a bit high for env temp.
If you want to go more extreme with air cooling/overclocking, THE status quo for Socket 478/Nortie overclockers is of course, the Thermalright XP-90 series copper heatsinks and Panaflo 92mm fan combo (and AS5, of course). It's a very expensive combo, but you can usually "to the moon" overclock these norties and drop peak temps to 39-42C at extreme overclocking rates.
Nice link here of how well this combo works in practice:
http://www.silentpcreview.com/article194-page3.html