I have 2 12w6v2's in a built to spec slot ported box in my Xtracab Tacoma. I've heard the 10w7 and the 8w7 in my truck, and while loud, it wasn't exactly something to write home about. Not much room in my cab as it is so its easy to get loud.
Now the 2 12w6's I have hit way harder than anyone ever needs to hear on my 9835 volume at 20 is about as loud as your ears can stand. Not to mention the fact that it feels like my doors and rear glass is going to fall off. I have 1100 watts RMS running to the 2 of them. So I'd say the w6 would be the one to go for. They can move some air and hit hard. A big ported box with 500 watts would be perfect. Then again this is coming from someone who's heard al of the above in the same vehicle, so take it for what its worth.