subwoofer question help!?

so how much do u people think it would cost to install 3 12 inch subs,like a 1500w amp,maybe a capacitator(idk if if thats necissary?) and maybe its own battery? built into the trunk (98 civic ex coupe)

kinda like this one--- http://carphotos.cardomain.com/ride_images/1/1589/3781/3971890005_medium.jpg

Thanks for ur help =]