I'm working on my own novus as a side-job right now. Like yours I'm working on Determination and Piety. Aside from that I'm putting in some extra points into accuracy. Accuracy?! Yes, accuracy.

Spell speed is not even a stat worth mentioning and crit, while it has it's merits for healing, doesn't outweigh the utility accuracy it could provide me. However, prefering accuracy over critical hit rate (or even, yuck, spell speed) is totally up to you. Critical Hit Rate increases your average HPS slightly with a small increase in critical heals. Accuracy would allow me to off-dps a bit more during moments when healing is not necessary at that point. Even when not casting Stone (II) or Aero (II), Fluid Aura benefits from it. Fluid Aura is an off-GCD ability with 150 potency. Free damage, so why not? It also proved to be rather useful during golem phases in SCOB Turn 4 (also known as Turn 9). However, if you're not the type that would spam Fluid Aura whenever possible or even consider casting damaging spells at all: Crit is probably the better option.

A discussion concerning spell speed can be found here: http://forum.square-enix.com/ffxiv/t...n-Nexus-weapon
Another discussion concerning critical hit rate can be found here: http://forum.square-enix.com/ffxiv/t...al-as-a-healer