Minor Spell Sequencer:
You can store 2 spells of Lvl 2 and lower.
eg. Blur and Mirror Image
Contingency:
You can store 1 spell of Lvl 6 and lower.
eg. Dispel Magic when 'Helpless'
Spell Sequencer:
You can store 3 spells of Lvl 4 and lower.
eg. Greater Malison, Lower Resist and Polymorph.
Spell Trigger:
You can store 3 spells of Lvl 6 and lower.
eg. Protection from Magical Energy, Spell Shield and Spell Immunity.
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There's still Chain Contingency, but I'm not too sure how that works. The spells are Lvl 4, Lvl 6, Lvl 7, and Lvl 8 respectively. Chain Contingency is Lvl 9.
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If not a Sorcerer, then a Paladin.