It is not really worthwhile trying to stockpile anything for an expansion - just about everything you need in the expansion's content will be provided by the expansion.

That said, get all jobs to 60, and get as many jobs as possible in Scripture gear. That, of course, will depend upon SE uncapping Scriptures and the upgrade items. I've already got my crafting and gathering classes at i190, so they are set. Just need to take the last 3 jobs to 60 and then get them all geared up.