Can someone help me find a 12" subwoofer that fits my box specifications?

look around at the specification sheets on woofers. the db sensitivity (i believe) is normally around 89-93db. the higher the number, the better. I would suggest jl audio for i have had some of these subs in 12", 10" and a few 8". all around i felt these were awesome speakers and i didn't have to put much power to them. another thing for the music types you listed try changing your box to a sealed. in my opinion if you take one of those boxes, put some quilt stuffing in the box before your sub you make the sub preform like it's in a bigger box and it will slam. i have the same taste in music and have run a setup like this for a few years now. i have 1 10" fosgate running on a bridged 800 watt amp and my box dances in my trunk.