I am intersted in buying a one 10" subwoofer with great spl and sql to put in a ported box for my Saturn. Something better than my two Infinity KAPPA 120.3DVC's i have in a sealed box. I want the ported box to take up as little room as possible in my trunk. I was going to buy an Eclipse sw9102 10" sub but the ported box size was over 2 cubic feet. Should i just expect that i will need a around 2 cubic feet per sub for a ported box or are their some quality subwoofers that require less room? Money is not too big of an issue (probably want to spend no more than $300 on the sub).