I use a 5V 10 A, https://www.adafruit.com/product/658
on my bread boarding Pi setup. I feed power to my Pi and other items via a panel mount barrel jack, https://www.adafruit.com/product/610
It powers my Pi 3B, Pi foundation 7 inch touch screen, Analog audio amp, and any USB devices I plug in. I made up my own custom cables. I installed poly fuses where I felt they were needed. I also use the 5 V 4A version of the supply I linked to above on another PI project. It's a portable unit with a powerboost and 6600 MAH LIPO battery. 4A lets me charge the battery and run the Pi at the same time.