Why Bard and Cleric?The best option, is to max everything, through 3 FVS/Wiz/Sorc/Bard/Cleric past lives, but that is not realistic for most.
Bard does absolutely nothing for this character. +2 Enchantment save is extremely mediocre except for the occasional dancing ball. Certainly not worth drowning yourself in 3 past lives.
Cleric giving +1 Conjuration is great for Wiz/Sorc and their CC spells. For a FvS, the benefit is marginal at best.
Divine Conjuration spells (where DC actually matters):
Heals vs undead
So...really, just Cometfall. Personally, I don't ever even consider taking Cometfall on a FvS. Level 6 has choices enough already, and a spell which does a fraction of the damage of Blade Barrier and checks against the same save (and is thus as equally pointless against evaders as BB) does not come close to making the list.