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#11
A very fast hard drive (AKA SSD) will make a huge improvement and will speed up your computer substantially.
Also, there comes a point when more and more RAM doesn't provide benefits unless you have applications or multitask to a point where you really chew up RAM. Going from 1gig to 2gig..makes a big difference. Going from 2gig to 4gig, makes a difference, but much less noticeable. going from 4gb to 8gb is usually not perceivable.