PPG 2021 high solids clear. Sherwin Williams CC 939 also is pretty good and easier to work with than the PPG 2021, as if you are not careful it will run like rain. I normally stay with PPG products. IMO they have better coverage, and their colors are usually spot on for blending work. I've tried a few different brands in the past only to have to redo the work. PPG is more expensive especially their DBC #1
paints but if you have to redo the work, you didn't save anything.
As far as clear coats can you tell us what you plan to do with just CC?