For as long as I can remember, my dad has always used Sherwin Williams paints in his body shop. I have never seen a vehicle come back because the paint went bad.
Shameless plug for Sherwin Williams

I have a dream, and that is a 69 Boss 302 with Jules Asner in it.
Current - 2002 Chevy Silverado
Former - 98 SVT E0 T-Red 4/4/97 #173 of 6535(so long girl, you'll be missed)