Ebay is your friend!!!!..you can get a freaking SYSTEM and a half for $1K from Ebay! NEW and some with warranty as well...If I may spend you money..here's a list for your price range.
Alpine Subs...$230.00/Pair Shipped
JL Audio XR650-CSi 6.5" Component System...$215.00/Shipped
SUB AMP.Lanzar Opti Class-D 800 Watts @ 1 Ohm..$160.00/shipped
COMPONENT Amp...Lanzar Opti SL150...150 Watts Per Channel x 2 @ 4 ohm..$150.00/Shipped
Alpine HU..7893...$270.00 Shipped
Wal-Mart 4 channel Wiring Kit 1000 Watts...$25.00 Local Pick-up
BOX Building $50.00
Total is JUST a little Over the 1K budget.
GRAND TOTAL of....$1100.00...WOW....Super Loud..Super Clean..Super Budget!!!!
Good Luck
Mike