competition system help!!

Hey everyone, I have a dilema on my hands. I am about to put a competition system in a civic coupe. I have nine twelves for a wall but I am not sure how I would go about it with wiring up amps. I would like to only need four but how would I accomplish this without drawing extra power from one of the amps for the odd speaker. I will be using two channel amps. I can go with eight twelves but I would rather go go with nine. Do any of you all have a suggestion for the setup of this system? I also will be going with a sealed wall so I am not sure yet about the airspace availabe in my civic to see if I would be louder with less speakers in it. any help is appreciated.

You might think about running 3 amps with 3 subs on each amp. And if your using all the space in the back seat area you should have enuff air space for 9 12's easy.