Need help with gears

Hi all, i am currently trying to gear my mage. Between my brother and i, we have 3 pieces of the Transmaterial set. We can have a 4th one, but we will be out of GC.

My question is… is it worth getting that 4th piece? Or just use Zaj armor pieces?

IMPORTANT i will not be using nightmare essences.

If you are going to play alot in the event period then yes otherwise no