To cube or not to cube?

I just charged 50k nx to my account with PayByCash and with that sale thing they have.. I should receive 60k in total. I'm debating whether or not to cube my gear. Currently the only Pot'd items i have are red rex earrings which I'm not fussy about.

So.. if i do cube things.. should I:

1. Cube my Dark Knights gear,
2. Cube gear for mages and make a BattleMage in BB or,
3. Cube my Sair's gear and alternate between sair and a mechanic?

PS with the 30% off black friday cubes will be 800nx.. so i could buy quite a few. :f6:

Cube or gacha. But if you cube, I'd focus on one or two equips to mainly cube.