Your average desktop machine these days, with fast disks, running Linux and Apache and not much else, would probably serve a decent sized web site while using 1% of its resources. Desktop machines have oodles of CPU power available, which only people like Microsoft and games makers manage to slurp up with their bloatware.
Also, when Randy referred to Ultra hard drives, I assume he means SCSI. My ancient 4GB SCSI drives still perform as well as current IDE drives in general use, despite the IDE proponents' (general cheap drive makers) claims to the contrary.
Randy, is there any good reason why your web server machines don't have NTP on them? Having the board's time 5 mins wrong some of the time, 71 mins wrong now, is just amazing, given that the technology to have the time correct has been around for years, is totally trivial to set up, and prevents sys admins having to spend their time (mis-)setting the system clocks.