I'm running Kicker compVR 12's now, and like asswhore, I've had them forever. I've never seen a sub take a beating for so long and last as well as these do. I really like the sound they put out, nice and crisp bass with hardly any distortion.
The JL w7 subs are great and all, but they are extremely overpriced. You could get 4 badass subs for 800 dollars; I just don't see the logic in spending that much for ONE sub. I've heard a w7 before and it was awesome, but not worth that much cash
Me personally, if I had the money and vehicle to cram it in, I would run 4 fosgate punch DVC 12's. I had a friend at one of my previous jobs running that setup, I never heard anything that hit harder for the few subs and amps he was pushing. I remember him saying he was hitting in the upper 160's, lower 170's (decibels) with four 12's.