the Thermaltake Volcano 7+ is a safe option.
it is quite cheap now, 15-20 quid at click here . It is designed to fit both P4 and AMD easily.
it is a coppper cooler, which is better than aluminium for cooling, and a 70mm fan. it also includes a switch to control the fan speed between low, medium and high speeds.
make sure to get the 7+ model, not the 7. the difference between the two is quite big - thermaltake would have been better off calling the 7+ as the 8, but didn't.
i run one on my XP2100 @ 1.9 Ghz (overclocked from 1.7) and rarely exceed 40 degrees. likewise, i have a chieftec, albeit with 3 case fans.