Just take the belts off and spin each pulley by hand. If they still have good sealed bearings, they will turn with no noise, but not keep spinning. Any of them that when you spin fast keep spinning for more than a second, the grease leaked out of the bearing.
Goodyear Gatorback belts are when I use (expecially on a supercharger) or else Dayco are good also and I think come with a warrenty (forget how long).