The problem is BiS is BiS when you pair it with the rest of the BiSs
Even then it depends on what you are fighting. Coil requires more accuracy than the extreme primals so you can replace some accuracy with other stats when doing the latter.
My suggestion would be try to get everything and mix and match based on what you are doing.
Get first pieces that will not unbalance your current set and if you have no other alternative, wait until you can get 2 pieces to balance them, and keep going that way.