If I were you, I would look at the ID Max subs. Amazing price, great output. Port the box if you have enough space. It will give the most spl. Get 12's if it will also fit. And I'd ditch the ****ty Xplod amp and buy a JBL BP600.1 (which actually puts out around 700RMS). That sounds like all you need.
I used to have two 10" Alpine Type R's in a 4.5 cu ft ported box tuned to around 40hz. It was a pretty nice system. I hit 140.5db's.
If it were me, and I'm a bass nut, I would pick up a pair of Resonant Engineering XXX 12's (rated at 1600RMS per sub), powered off a pair of JBL BP1200's amps. I'd make a 6-8 cu ft box and tune it to 33 hz or so. That would pound....
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