If you don't raid and wont be clearing t13 anytime soon, I would recommend you push for the final zodiac. You wont be missing anything grand when it comes to the story, but unless you want to wait for when SE makes Unidentified tomes available to everyone (which maybe soon) and get the augmented poetic weapons, go for the zodiac.

Basing off of SE's previous trend, the next zodiac is either i130 or i135