New system, 2004 Chevy Trailblazer

I just purchased a 2004 Chevy Trailblazer....

I did not get an XM satilite radio but would like to have an aftermarket one

I did not get a DVD player in it, but would like to have one as well.

Several Questions..   I am just now learning the terminology - FM modulators,  Y-splitters, etc..  this is all foreign to me.

Here is what I would like to do:   I would like to have the Sirius system (although I am open to XM as well)  and would like to keep my brand new head-unit (with CD player only - no tape player)

I like the looks of the XM commander for XM,  and the Audiovox S.R.S. for Sirius

I would like to still be able to use my CD player, FM and AM radio.

In addition,   I would like to install headrest mounted screens (two of them)  without tearing up my headrests (I like the looks of the ones from epikproducts.com, but don't know their quality level)

I would like the sound from the DVD to be able to be played over the speakers, but also, when not played over the speakers, to be able to be heard from some wireless headphones.    Can I do this w/  Satilite radio?

I would like the ability to hook up a playstation into the player to use on the system (and I learned a new term called power inverter.. what is this all about?)

Basically, if you were me, and you didn't want to install any of this yourself, and cost is not really a limiting factor (although I would like to stay sane)    what would you buy,  where would you buy it,  what would you look for in an installer,  what is your thought process in making the decisions?   Is this system I have described even possible within reason??

Also, I would like to avoid junking up my car with tons of wires running around.. am I asking too much here?

Advice Please!

I'm assuming your brand new head-unit is your factory one so you will have to use and FM modulator to listen to anything besides cd throuh your factory radio. An FM modulator is a box that basically connects between your cd player's antenna input and the vehicles antenna output. It then broadcasts the signal being input into it (satelite radio, dvd playstation etc.) onto an unused FM radio frequency. An FM modulator usually only has one input so you will probobly wanting to use an externall source switcher if you want to listen to dvd or satelite radio. I know Pioneer makes one. its the CD-VS33 that has a small control panel that is seperate from the main source box and controlls the source selection and has a third input for your playstation. You would proboly hide it behind the dash or under a seat, same with the Satelite radio tuner and an FM modulator. You can connect some in car wireless headphones to this main box or some regular wired ones to the external control panel(it has a level control on front). I only know of one brand of headrests that have a monitor built into them. Vizualogic makes a custom headrest for your 2004 trail blazer that has a built in 7" widescreen monitor. They cost $599.99 each and come with a remote and two A/V inputs and 2 A/V outputs. If you do decide to bring along your playstation you will need a power inverter. A power inverter takes your cars 12 volt power and turns it into a 110 volt outlet/outlets. There is a wide variety of them with different wattage ratings and number of plug-ins. If you are planning to plug more then 150 watts into it you cant use your cigarrete lighter. You have to get power directly from the battery. Finally if you want to watch dvds in your trailblazer look in car dvd players that can be mounted under a seat or in the dash. Some of these require direct power and other require a power inverter. You can look at all of these products and get knowledgable information on what to buy at www.crutchfield.com 

 Well I hope this helps you. Sorry for such a long post