I've heard different things for different classes. I play a Bard and I've heard just pumping my main stat, DEX, was optimal. I've also heard that sometimes adding some to PIE for more MP which increases song duration was sometimes a good idea, too, but optional. However, I've read that on Lancer, for example, you spread it out a little more. I've seen that you'd want to pump STR as much as you can but then follow up with VIT and also DEX. Various external sites have people's opinions on this and I think some people are experimenting to try to provide people with hard numbers to answer this a little better. So we'll have to wait and see. In the meantime, check out the forum specific to your job and maybe see what other people playing your job/class are saying. Hope this helps!