If you decide to install the gfci`s you may want to change the breaker feeding the circuits now with a gfci breaker .Yes this will cost a little more but if the breaker that now exist cuts off all the outlets you`d be asured to have it all protected.This would be better for kitchen depends on the layout of circuits.In garage maybe change to gfci rec. Most of the time here in NC we`ll do these things for the realty company as the loan provider is protecting their investment as well...
