I like big hard drives mostly because I never delete anything. Ever.

And since this will be my personal system for a few years (longer than that, if I go to the trouble of actually getting it upgraded), I'd like to be able to essentially install everything I own on it, for the sake of ready access.
I'm not popping for an AMD processor for three reasons: most importantly, I suppose, is that I want a Dell system, and Dell is an Intel-only company. Secondly, AMD does not yet offer Hyper-Threading tech, and I'm really not willing to wait another year or two for its implementation before I can buy a new system. Lastly, there's a practical side to it; the only advantages AMD really has over Intel are its performance in some really graphic-heavy games--stuff like Unreal and Return to Wolfenstein, games I don't even play--and its 64-bit capabilities. 64-bit applications are an empty market for "casual" users like me right now; there are no specially-coded programs that make use of the feature, no operating systems, and so on. In addition, I'm not sure about how 64-bit processors handle older, 16-bit applications; I play a number of old games like Master of Orion II and Dune 2000, and I'm worried about issues of compatibility.