Because I listen to a lot of rock and the HDC3's are way punchier than the Z's. There's no doubt the Sundown is a higher quality piece, but I got two HDC3 12's for less than a single Z. I couldn't pass it up.
How much picked up?
feedback and references here: http://www.caraudio.com/forum/showthread.php?t=427479
$300 + actual shipping
Money sent plus an extra $10 to cover PayPal fees
MECA Amateur SQ
2008 Scion TC