18V cordless angle grinder with battery and case included.
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.
It causes more workshop injuries than any other tool, almost always for the same reason: removing the guard so it 'fits better'. The guard contains the sparks and protects you if the disc shatters.
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.
