I agree with Cabbs, a TRUE is the way to go. Here is a comparison
between the Copper and the standard. You have to be prepared to lap a TRUE yourself though or it will never be worth the money.
Pair it with a high airflow, static pressure fan such as the Sanyo Denki Cabbs recommended. The Scythe Ultra Kaze or the Silverstone FM122 are similar but often easier to find in stock.
Arctic Cooling MX-2 is the thermal paste I use.