Exactly like others have said. Do not go broke building up your Relic. I was 10 short on Determination for a full crit/det weapon so had went with accuracy to finish it off.
Finishing it off is more important also so you may begin the next stage, also you can later change a stat should you decide to later on.
My weapon still cost me well over 2 mil btw, Nexus stage costs you even more just as a heads up. Start saving gil and Grand Company seals once you have your Novus complete