Well, the best way to do that, I found, was to buy the components whose value isn't as dependent on current dollar value. Hard drives, graphics card, and even motherboard can be obtained fairly inexpensively, and their cost value won't fluctuate much over the purchase period. The expensive stuff is usually the memory and the CPU, with the CPU being the last one. Just make sure, if you follow this method, that you get a CPU which will work with the motherboard. One option would be to get a mobo which runs a somewhat more advanced CPU (on the high end) than you can afford, and see if it is affordable by the time you're ready to build the unit.
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Those who fear the darkness have never seen what the light can do.
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Those who fear the darkness have never seen what the light can do.