Ifrit, Moogle, Garuda, Titan, Shiva, Leviathan, Ramuh, Odin = 8 Primals
GLA, MAR, PUG, LNC, ARC, THM, CON, ACN = 8 Classes
So that would be roughly 64-70 primal weapons depending on primal shields. After the 5th primal or so would weapons still be shiny and unique? I'd just like to see different kinds of rewards from primals, be it armour even accessories, or perhaps vanity gear to change the appearance of your proper stat gear.
