The Thermaltake Big Typhoon is the best air cooler you can get your hands on. Just make sure it will fit on your mobo/case before buying it.
You can also get the Thermalright XP-90C which doesn't include a fan. So you will have to get a separate one.
The "Panaflo 92L" makes a good fan for this cooler.
Also, the "Nexus 92" fan is very quiet.
The XP-90C is about 10 dollars more than the regular XP-90. The only advantage is that killer copper colour, and about 1-3c temperature change. I would suggest the TT BT aswell as it is a super-cooler. If you are on a budget, for a little less you could pick up a ThermalRight XP-90 and fan (aboud 55 bucks together) and it will be around 5c hotter.
The Zalman 7700CU (all copper version) is also an excellent cooler. Its a bit cheaper than the big typhoon and all of the results I've seen have it about 1-2C hotter than the typhoon. I'd recommend the typhoon as well but there are two items that may make the zalman better. First, it fits easier into some cases. Its much lower profile. Second, its much more effective at cooling nearby ram and mosfets as a result of its design. The typhoon blows air straight on to the heatpipe bed but the zalman blows air down through its fins and out onto the motherboard. Considering also that it will probably overhang at least one of your ram chips (And still blow air onto the second), thats the reason I stayed zalman. 1 or 2c better on my cpu isn't enough to overcome the benefits of mobo cooling.
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