There are a LOT of bangin' 8" subs that will roast a 10 or 12 in the right enclosure just a thought!!!
I have the JL audio 8W7 to go along with the 500-1,and I am using a sealed box 14 in. x 10 in. x 16.75 in.,the box is small enough for quick removal if needed,I dont want to loose the enormous trunk as this was a big factor on my decision to go with a vette(hatch back) me and the wife like to throw the 2 man tent in the back and dissapear north on accasion! Actually I am insatalling the amp in the cargo well,I am not too worried about heat as this amp never really got hot in the last car I ran it in.