Dewalt 18v cordless angle grinder. It burns up batteries, but cuts fast. Metal blades for steel, cast iron, stainless, hardened steel. One 3 year old diamond blade for tile, stone, clay pipe, & concrete. It works far far away from home, & won't kill me if I run water into it while cutting a pipe.
The rest of the Dewalt set. Sawzall, drills, etc. They all work far far away from home. The sawzall with a rough wood blade makes quick work of tree branches on trail work days (For those of us not Forestry Service certified on a chainsaw yet). Most of the tools have plenty of power, but the circular saw is kinda weak.
Hydraulic press. I got one about a year ago. Many jobs that were difficult before are just easier with it.
Air chisel. I don't use it much, but it makes quick work of certain tasks.
Drill press. It drills faster & more accurately than handheld drills. I have an adjustable wood base & fence that makes repetitive drilling quick & easy.
Baby Vise-Grips. There are some jobs that baby Vise-Grips can do that almost nothing else can. I lost a set once, & found them still hanging on to that stripped out brake bleeder many miles later. %)
25' speaker cord test jumper with alligator clip ends. It works good to run known hot & ground from the battery to replace parts of circuits for testing. It's heavy enough to provide temporary power to a lot of components. I've clipped one end to the component & a power source, & used the other clips at the other end as a temporary switch inside for testing or to get home.
Floor jack & tall, heavy duty axle stands.
Learning to weld & a welder are on my wish list.