Thanks for all the responses, other than the ones that went off topic.
I am kinda thinking of the "wow factor" Id love to have some little 8s that just impress the hell out of people.
And as far as people saying the same area as the 12s, well my CVRs are in tiny sealed boxes, like for a truck. Surprisingly they seem pretty loud in the boxes. I can get away with the box they are in right now for the car, but i dont want to go any bigger. Its in an 82 ***** am. And id like to keep the box below, or close to the top of the back seat so i can still see out the back.
But then again, with the 8s it should be alot easier to build a custom box in the rear "well" area for more volume for the box and still be out of the way. Im thinking i could easily fit 3 of them in there, if not 4. Then the thing is where will the ports come out if in that well area.
The DD site says the 1508s handle 500rms. But can i throw more than that at them daily? Someone said 1k rms daily and doing fine. But im kinda afraid to throw taht much power at such a small sub. Are the DD subs way underrated or what? Cuz i see alot of people saying they handle alot more than what theyre rated at by DD.