1: Resurgence [Spell Compendium]: Give someone a reroll on a failed saving throw.
2: Silence: Fun to cast on an item carried by the grappler. Or to cast on an item early and drop it on the battlefield with a free action.
3: Conviction, Mass [Spell Compendium]: Everyone gets +4 morale bonus to saves for 10mins/level. +5 at level 18.
4: Dampen Magic [Complete Champion]: Can be used to make a mini-AMF. Perfect when coupled with spells like Anticipate Teleportation, so that you can position yourself where a group of enemies would teleport to and waste their teleportation.
5: Boreal Wind [Frostburn]: Damage isn't amazing but it the spell has utility, can be used to alter the battlefield to our advantage and lasts long enough to be useful through the entire fight. In the right situations, it is one nasty spell.
6: Find the Path, but you already have it.