yea i got my setup for around $1000 from jb hifi aswel, ill take some photos today and send them to you, basically the sub is not mounted to the floor in any way incase i wana remove it down the track,i DOUBT it will move around unless i drive like an absolute F*%*head..
BUT my amplifier is mounted on the roof of my boot upside down pretty much next to the right 6x9 speaker , soo it is out of the way and easily accessible.
i have no loose wires anywhere, the whole installation cost about $250 from Kim Car Audio in canley vale, top job i would recommend them to anyone.
definately a good choice mate