Good luck achieving 25°C or even 30°C CPU temp.
Heat sinks' effectiveness is rated in °C/W (degrees Celcius per Watt). The very best air-cooled heat sinks with the most powerful fans can get down to about 0.22 °C/W. What this means is assuming your ambient case temp is 25°C, and your CPU is putting out 75 Watts of thermal energy, the very best a air-cooled HS could hope to achieve is:
0.22°C/W x 75W = 16.5°C
over ambient (case) temp, or 25°C + 16.5°C = 41.5°C.
It's pretty common for an overclocked TBred or Barton to put out 90 Watts at 100% CPU output (like when running Prime95 or SETI@Home, many games, etc.). Even if your could keep your case temps at 20°C, if your CPU is pushing 90 W, then the best air-cooled temp you could hope to achieve is about 40°C.
0.22°C/W x 90W = 19.8°C over case temp (20°C + 19.8°C = 39.8°C).
Most of the time, you will not even get that 0.22°C/W efficiency, probably figure about 0.25°C/W to be conservative. There are a lot of coolers that can get you in that range. See article and rankings
here.
Good luck on your search.
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