We've done Le Cellier with a party of 13 in '07 and a party of 10 this year. They are also very accomodating. It really helps to have first seating.
I also like that the servers sing before seating the first seating...that's a little WDW secret.

Love, love, love the food at Le Cellier. My mom says she'll never go back to WDW as she's 70 now, but that she'd fly back just to eat there once more. LOL
I have not eaten at the others, but I think friends have done a bigger party at both Prime time and WCC. My brother's family just loved WCC, but we have not tried it yet. Maybe next trip???
I hear issues with Mama Melrose's, so probably not a good choice, but you could make a separate post on that one.
Happy planning!
ETA: Love seeing all of your kids...we don't see many other families with more than 3!

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We love Le Cellier, too. We have eaten there, on our past three trips and the other family we are traveling with, requested it. I'm happy we were able to get it. I had to book a party of 10 and a party of 4. It is such a tiny place, that we are hoping to be, in close proximity to each other.
The other place we had to do that at, was Prime Time. WCC,Ohana,CM's and CP's, are all for a party of 14.
Thanks for the nice comment, on our kiddos. We never anticipated having five, but we love our big family. Although, we are done. Congrats to you! I know your days are blessed!