Great thread. 2023 for me has been a year of far more selling than buying, and most of my buying has been set chases. That said, here's my Top 3 of '23:
1. I've always got my eye out for nice Shaq Magic uniform cards, and I also collect the 2020-21 One & One Legends Gold set. When I saw this, I was hesitant to throw a bid on since it was already up towards my limit. But I did anyway and this thing just pops with the gold and the classic Orlando pinstripe uniform.
2. Obviously not basketball, but the 92-93 Beam Team is one of my favourite sets ever. So when I saw these UCL Chrome ones, I got interested in what a new take on them was like. This Haaland was a surprise find a day before the auction ended, so had to do a bit of retroactive selling afterwards, but the Black /10s look so good that I collect this set as well now.
3. Not much story here, but this was the first Zion Prizm RC I ever owned, and I only got it in June this year.

The massive price drop meant I could consider it, and I got it for a great price with a last second bid. I love the blue shimmer actually - reminds me of the X-Cited insert from 94-95 E-motion.