My home was built in 1958 with romex and ungrounded 2 prong outlets. We are currently upgrading the breaker box from 60 amp service with fuses to 100 amp service with breakers. It would be nearly impossible to rewire most of the outlets without major work. We are debating whether to use a GFCI outlet at the beginning of each circuit with regular ungrounded 3 prong outlets on the rest of the circuit, or just install ungrounded 3 prong outlets everywhere and use GFCI breakers in the breaker box. I know the GFCI breakers would be a decent amount more money, but might save time tracking down outlets in a circuit. Also, there are 2 GFCI outlets in the kitchen and 1 in the bathroom, if i went with the GFCI breakers would this cause a problem for these outlets? Thanks guys