I'd have to go with Rydia, Rydia, Rosa, Rydia, and Rydia. Though, I might have to replace a Rydia (maybe Cecil, Golbez, Kain...FuSoYa?), because that way I could have a Rydia in the middle and on top and bottom. And Rosa's only there to heal.

I just like when she's in the middle and steps up to summon, and she's like the tip of the spear, the top of the triangle, that the characters make. I'm just weird like that, I guess.

How is Porom a better White Wizard than Rosa? And which spells does Palom learn earlier than Rydia? I've never used them in their higher levels, so I wouldn't know. I've also never used Boast too much, but I highly doubt that could be more useful than Summon.