Right now my audio system is surely entry level but it's still in the works, but i own a 2007 Ford Fusion and here's what i got so far:
In the trunk i have:
2 JL Audio 10" W0V3 4 ohm
A box built to W0V3 specs and tuned to 36hz (would go to 32 if i had better subwoofers)
Mounted to the back of the back seat i have:
1 JL Audio Slash 500/1v2
In the front and rear doors i have:
JL Audio C2-650 component speakers up front. (running off deck power)
JL Audio C2-650x coaxial speakers in the rear. (running off deck power)
Up front i have:
Kenwood KDC-X597, with the bluetooth mic ran up my door trim facing the driver.
I used a Wirez 4 AWG amp kit, i'm a personal fan of Wirez. It included 4 AWG power and ground wire, 120amp blade fuse block, remote wire, wire loom for the power wire and it came with speaker wire which i used for my crossovers.
Later on i plan to get a 4 channel amplifier for my speakers, probably the JL Audio JX360/4 and to get an XS Power battery. I dream of owning W7's one day. :) Tell me what you think!