For us:
Super-kingsize bed (tall husband, and I am a claustrophile and like to sleep halfway down it)
Kenwood mixer - wedding present, has been invaluable over the years
A good panini grill - also a wedding present but we use it almost every day and it's been going strong for 18 years.
Well-made pans we like using. Our stainless pot with two steamer baskets wasn't expensive, but it's like new, despite daily use.
As many Billy bookcases as we can practically fit in the house.
Our Sebo vacuum cleaner. Our rugs never looked so good before.
For me specifically: a neoprene laptop case, a portable laptop stand, a neat organiser bag for my charger and cables, a Kindle with a case and stand. For clothing: wool to make socks that custom-fit my feet, merino base layers that keep me warm in winter (I'm always cold), several pairs of my favourite cut of jeans (Lee's Marion) so they're never all in the wash, and comfy shoes. I scored some secondhand Natur Sko boots a little while ago on Marketplace and I would happily pay full price for more in future - my feet really like them. I also find it worth paying for real Birkenstocks as none of the similar brands support my feet as well.
Things I haven't bought but would consider: spring lawncare, a professional declutterer, repaving our back terrace.