A smartwatch. As a formerly fat guy with insomnia, the sleep and fitness tracking have been life changing.
Replaced all the screens in the house with 4K 144Hz HDR OLEDs. Once you go true black, you don't go back.
A 4090. Stayed up for the midnight launch so I could snag one at MSRP. People mocked me for spending $1600 on a GPU, but given recent events, turns out that I actually got a good deal instead. This GPU will easily last me a decade; hopefully long enough to ride out all this tariff and inflation bullshit before I have to build a new PC again.