For P3 or AMD, the Thermaltake 6cu is one of the best fans for the money, like electrode mentioned. The non-plus version is very quiet as well (minimal hit to performance). Globalwin has issues with bad clips and tend to pretty loud, most of their models use the Delta screamer. To get both overclocking performance and low noise at a very reasonable cost, the Alpha 8045 with a Panaflo L1A cannot be beat.