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I hope for your sake that Dell has started using somewhat-better hard drives. We had to replace the original 40GB on my family's 2001 machine after a year or so of use when it randomly bought the farm, and I suffered through the Click-o'-Doom on my 2004 Optiplex's 160GB drive for a few months last year before finally giving in and replacing it. At least the rest of the system has run reasonably well over its lifetime; before I get around to building my own system, I'll probably throw some more RAM and a new video card in here.
A.K.A. Mongoose, for you HLP denizens