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Also, dont be limited to just one servo per joint. The base joint can have two servo's (one on each side) rotating the arm. This way you can either double the torque, or have two smaller (and cheaper) servos actuating it.
Again, your only option is to do gearing. There are no servos any stronger.Robotzone has this item that can multiply torque by x5 on the HS-805BB servo:http://www.robotzone.com/customer/product.php?productid=186&cat=51&page=1But personally its way over priced for a gear and some plastic hinges. Better if you copy and make it yourself.