18V cordless circular saw with battery and case.
Cordless gives mobility and lets you work where there is no socket. The cost is depending on charge: for long continuous jobs a second battery is worth having, since consumption rises fast in thick material.
The blade cuts upwards, so chipping ends up on the top face. Working with the good face down keeps the cut clean on the side that will be visible.
Goggles or a face shield, gloves and hearing protection depending on the tool. This is not a formality: in this category, the difference between a scare and an injury usually comes down to whether the safety gear a metre away was actually used.
