Best for what? Best for AutoX, best in vintage class or best in the unlimited class, best for the buck, best for cobble roads and crossing train tracks...
I saw your Hotchkis post and wonder if they are for the bling show crowd or hardcore racers. If i were wanting a race car I'd start with a better platform. if i wanted the best a '68 could fit it would be something along the lines of a Jag IRS. Alas, even F1 cars have budgets.
If i were to pick a single vendor for everything i think it would be GlobalWest just for their Cat5 leaf springs and +3 caster upper arms then the rest of the fill in the blank parts.