2 15's in accord

The box design will be based on the subs themselves. Some work well in sealed while others work well in ported enclosures. If your particular subs work in a ported box and you can build one or find that fits the requirements I would suggest going that route, because by the sound of it you want the biggest bang for your buck.

Given I have the same vehicle as you, I found through trial and error that the majority of boxes sound the best  located up against the rear seat facing the rear of the car. Now you may find it to be the opposite, but that just seems to work well in that car. AND I would highly suggest getting a hold of some sound deadening material asap. Do a search here for plenty of info on deadeners.

right now you can get a gallon of second skin spectrum for 39 bucks then the gun for it for 15  and right now they got a group buy goin on where u can get an additional 20% off   or u can get any second skin product

check it out,   secondskinaudio.com