Either the 3pc digital torque wrench set from Snap-On, the 10lb slide hammer from OTC, or the Milwaukee M12 right angle grinder.
With the ATECH 1/2" digital I can finally do stake nuts over 250 lb-ft without just kind of guessing and hoping I got it right, and it's reassuring to be accurate. It was either buy a Snap-On 1/2" digital or buy a 3/4" torque wrench, and the dealer had the 105th anniversary set in blue so I got suckered in for all three.
The 10 lb slide hammer removes everything, always, with minimal effort. Sometimes on the first swing. It's unreal how much more effective it is than the 5 pounder, I can't believe it took me so long to buy one. It pops wheel hubs out in 3 slams or less, even the ones covered in rust and filth. I use the U-shaped CV popper with it to break stuff loose all the time too, just wedge it under things and hammer until they release.
The die grinder is like, wow. I can't believe I didn't have a battery powered die grinder sooner, though apparently they all sucked before this one. It's incredible. Powerful, lightweight, comfortable. I use it for everything from sanding off mill scale to deburring steel edges and drill holes to polishing the chrome on my tools. It's gotta be my second most used power tool now after the 3/8 impact, I can't believe how much I love the thing and find new uses for it all the time, even after having it for a year. Everyone should have the Milwaukee right angle die grinder. Half the reason my box looks the way it does is this thing and a tube of Flitz can buff out scratches on like any chrome in seconds, makes it easy to remove all the evidence after I smash ratchets on the ground or the frame all afternoon.
Oh, honorary mention, Astro Pneumatic plastic welder. I've fixed so many cracked and broken trim pieces and even my own blowmolds with it. It's so simple to use and works incredibly well.