I would personally wait on the HQ acc. (right hand side). Due to 2.5 being right around the corner and the introduction of i110 crafted for left side, right side is def up for its upgrade in which grinding on your own would be the best bet because breaking the back would run you at least 500k-1mil not even including the materia in which (if you're serious about gearing) will also run about 1-1.5mil pending your success at melding.

Gearing now I would aim for the ScOB gear as it is proven to suffice through to T13 already which will yield you the best gear at least until Expansion. (undoubtedly they will add a i130 primal acc, or wepaon in due time before expansion)

But yeah try t6-t9 right now for gearing

I currently wear that with a mixture of poetics gear with a relic and I've progressed p3 t13 so its all good lol