if you want to overclock that XP1800+ to hell then i really reccomend either the alpha PAL 8045 or the even better Swiftech MCX462.
i just got the MCX462 today. it cost a bucket but its the sweetest heaviest nasty air cooled heatsink you find
cant wait to install it!
P.S. dont forget that an Overclocked FSB also overclocks your PCI cards, AGP card and cd/hard drives. some things may get touchy at 150fsb or above.
Excuse me for a moment. I need to drive my ergonomic wheely chair over a sheet of bubble wrap!