Cube in what order?

You might want to do your crossbow while platinum cubes are around. You have the best chances of getting good potentials with those.

Besides that, my order would be:

Tyrant Belt
Tyrant Cape
RA helm (Extra adv bless line)
RA top or bottom (only if you can switch to 3 set asap, top first for invincibility, bottom for hb)
Badge
Heart

I would put the rest on the back burner for the time being, with all the new accessories KMS has just released.