15" Toshiba Satellite running Windows 10. Bought it cheap ($450 USD) three years ago. 1TB HDD (not SDD, sadly), initially had 6GB RAM, but recently upgraded to 12GB... more than I need at this point. These days, I use this mainly as a dumb terminal since I VPN and RDP into a more powerful desktop at a remote location. When not working, it's a research tool and gaming machine (Intel Core i5, so not too bad with games I like).
All this said, I'm considering going down the Compute Stick route and/or a mini-pc. Look up "Intel NUC". These days, specs are pretty good on those and they're super small.