Well I don't know a whole lot about computers, but if you're doing a lot of video editting, especially doing multiple projects at a time, HD space is crucial. I'd suggest reserving around $100-$300 for an external HD if you don't have one already and not even bother trying to match the built in one for that purpose. It could take up potentially hundreds gigs of space.
Gaming is really the number one aspect that makes computers "out-of-date" so quickly. Most other stuff is relatively easy to run even on computers that are considered old. $2000 should get you plenty.
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