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You can put 5 sprockets on a hope singlespeed hub, but probably not worth it.
http://forums.mtbr.com/drivetrain-shifters-derailleurs-cranks/yes-i-am-going-10-speed-495936.html
That really depends on what you plan to do with it.
A few hours mucking about in the local woods = win
Multi-day ride in mountainous terrain = maybe not so much