First off let me state: Im not that guy who thinks his car is off the hook and better than yours...
I have a 2001 Infiniti QX4.
Black on Black wit navigation and everythin else that can come from the factory...
22" Chrome ASA HM2's (this was the second cheapest set I could find, clearance at tirerack) wrapped in Pirellis (all the tires were the same price so why not)
Here is the Alpine CDA-9855 Reciever underneath the navigation
Here it is at nite
2 12" Rockford Fostgate Punch HX2 Subs
800 watt Rockford Fostgate 750S amp powering the subs

1280 watt 4 channel Niche Audio amp powering the speakers
Here is one of the Niche Audio speakers and I also added Niche Audio 1" tweeters below the windows in the rear doors.
Here's the XM antenna behind the tweeter
Next upgrade would be limo tint... but I'm screwed cuz I have 7 back windows and I cant afford that right now
Maybe I'll get a drop down DVD player... but how much do I really care about the people in the back seat who don't chip in for gas???
What I'm especially interested in is an adaptor by Peripheral that will let me display other sources like DVD on my factory nav screen... anyone know how much that'll cost me?