CPU coolers

So I had a stock CPU cooler and my processor was running at 69 degrees celsius, and I decided that was too hot. So I picked up the biggest Zalman that would fit into my normal sized case. Now my computer runs 15 degrees cooler under a load. There's bigger and better heatsinks out there, but it was hard to find something that would provide a lot of cooling and not need me to buy a new case to fit it in.