Enhance spell is really useful if you are the blaster type. Depends on what you push your caster level to.
Lingering spell can also be useful, but it is much better if you can go the persistent spell route. Not sure what your build is, but lets try:
Bard 4/Cleric 1/Eldrich Master 4/ Incantrix 1/Sublime Chord 1/Incantrix 9+
Elrdich master is from dragon 280. At level 3 it grants a spell slot one level higher than you can currently cast so a 3rd level bard spell. At fourth level it adds another classes spell list to your own, choose cleric.
Feats not in any order
Arcane Thesis Miracle
Extend Spell
Persistent Spell
Divine Metamagic Persistent
Alternative Source Spell
Practiced Spell caster Sublime Chord
More metamagic
Epic
Lingering Spell Miracle
Now you can persistent buff with miracle and disjunction only turns them off for 1d4 rounds.
Likewise you can go:
Wizard 5/Incantrix 10/Shadowcraft mage 5/Incantrix X
Perform the usual Silent Image coping a miracle tricks taking Lingering Spell for silent image. Use Incantrix to Persistent spell for free.