Well i have 2 Zeta Weapons (Bard and Blm) 2 Novus weapons, 1 animus weapon.
Cost of materia has gone way down from what it used to be, like determination material was 600K each and i lost so many of them
Now i think they are less then 100K, go figure...
At this point in time however you do not have to worry about min-maxing the stats, like others have said it is mainly glamour for now.
The entire quest line for Relic has been nerfed so takes far less long then when first introduced, so i say go for it and take your time. Just do not do multiple full Relics like i have, you may loose your sanity, lol
My first Relic had taken me a little over 4 months just to get atma alone and now all 12 can be done in less then a week, just so you have an idea of how much it was nerfed