I'll second or third or fifth the Continental GP 5000 tires. They run a true 28mm on my rims, whereas the GP4000sII they replaced were about 1.5mm-2mm wider than advertised on my rims.
It helps that you can run a 28mm tire at a lower pressure than a 25mm or 23mm, of course. A reasonable range for 28mm is 85-100 PSI, depending on your weight and geometry. Being able to ride a 28mm tire at 90 feels nice, compared to a 25 at 100+.