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Homes less than 10 years old will have a modern type breaker box. As far as cost goes, that is a good thing if an upgrade becomes necessary. In this type of house, the breaker box will be a minimum of 100 amps, and probably have enough available open circuits to allow upgrading without needing an entirely new panel. This type of upgrade can usually be completed between $363 and $1004.
With standard-size boxes, there may not be enough room to add a GFCI receptacle safely, making a GFCI breaker the better choice. Cost can also be a factor in the decision. A GFCI breaker might cost you $40 or $50, versus $4 to $6 for a standard breaker.