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You can probably buy 5 or 6 GFI receptacles for the price of one GFIbreaker. Also, it is much more convienient to reset a recaptacle versus going to the breaker box.
For your second question, if you can install the outlet so that you are not protecting things that don't need protection (like a refridgerator), put in one outlet & let it protect others. If you're not real sure about how the circuit is wired, install a GFI receptacle at each location that GFI protection is called for.