I'm with Hanky, the ystech he mentions is at the limit for many, just over for a similar number. The Delta fan is for deaf people who live alone in the country, and don't have any dogs.
If you are upgrading the HSF in one of your profiled K6 rigs, be sure that a pep66 will actually fit. Lots of people have problems with that, pep66's were designed for Intel processors on slotkets. Some outfits offer them with a low profile fan, these are an easier fit.
An Alpha pal6035 kit with standard sunon fan from 2cooltek would likely serve your purposes just as well. Their big blue Vantec is also an excellent choice, at a considerably lower price.