I actually tried Ben Moore/Sherwin Williams/Valspar/Behr/Glidden.
For widely available paint...I went with Behr "Mickey Mouse Ears" Black -- blacker and with less sheen than all of the widely available others. I am not a Behr fan (firm SW/BM paint fan) but this is a serious flat black. Just be sure your surface is clean and without imperfections as a flat black will show every imperfection. Also, because it is a flat black, it will scuff easily.