Expensive thermal grease really isn't necessary. You'll get at best 1-2C cooler with something like Arctic Silver or Nanotherm. Plus, Arctic Silver tends to void warranties. Its electrically conductive.
Ceramique is your best bet. Heck, I'm using generic white paste on my new XP2500. I'm running at 3200+ idling at 111F. Heatsink is a Thermaltake SL700 or something. Its big and copper. I really think that CPU cooler is holding you back.
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