What do you need a computer for?
I guess it comes done to the question; What do you need a computer for? For many people it's web, email and simple documents. You can expand upon those and add photos, videos, simple games. All of these can be done by any number of OS's and hardware from old computers to the latest system. Business and Power Users need much more however the majority of people seem to just need the basics. Choose what fits you best.
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