Cometfall or Mass CMW?

[hydra_ex]

I'm going to TR my wizard into this caster FvS. I plan on using the Amrath clickies instead of lorrik's III for my devotion.

But, I run into a problem... I only have 3 lvl 6 and 7 spells! I can't decide between cometfall and Mass CMW. So, the way I see it, I have two options:

1. Take cometfall and cure serious wounds mass
2. Take CMW and symbol of stunning.

I've duplicated the spell list below for easy reference:

Spells:

1) Bless, Command, Cure Light Wounds, Nightshield
2) Cure Moderate Wounds, Hold Person, Soundburst, Resist Energy
3) Aid Mass, Cure Serious Wounds, Prayer, Protection from Energy
4) Freedom of Movement, Holy Smite, Restoration, Shield of Faith Mass
5) Cure Light Wounds Mass, Greater Command, Raise Dead, True Seeing
6) Blade Barrier, Cure Moderate Wounds Mass, Heal
7) Destruction, Resurrection, Symbol of Stunning
8) Cure Critical Wounds Mass, Deathward Mass, Symbol of Death
9) Energy Dragin, Heal Mass, Implosion

Any advice is appreciated.