In Memoria, I like:

Eiko-healing is always good, and half MP cost + holy=yay

Vivi-Flare, Flare, Flare, Flare, Osmose, Flare, Flare...

*As an added bonus, you can have Eiko cast Carbuncle to Reflect everyone and then have Vivi reflect an elemental spell off of EVERYBODY at once for an easy 9999*

Freya-maxed out Dragon's Crest and Reis' Wind

Amarant-Chakra ability for Freya and Eiko for restoring MP (I'm stingy with my ethers), Revive is handy because it restores more than a puny 5 HP, Aura saved my butt on numerous occasions, and Curse is a nice touch to the Reflect trick above. And he's got good attacks.

Although Freya might be replaced with Steiner once I find that stupid Ragnorak...