Cost of Install?

I own a 2002 chevy cavalier....What would be charged to have a 7" screen, aftermarket HU, and have the Heating an cooling controls down to a non-existing area(below where they are now)???? 

So let me clarify this a little better....the 7"screen would go in the place of the factory radio.....the aftermarket HU in the place of the heating and cooling controls(I am gonna be using a cd changer if the cds would not go in the HU easily because of the shifter)....and the h + c controls in the open space below where they used to be.

If you have a better way of doing this, please feel free to give me your input.  I would like to keep the vents where they are if possible.

hey that sounds pretty cool ! I know i should start a new thread for this but i woudl really liek to switche the posistion of my HU and heater/ ac in my 2001 gmc sierra. i jsut bought a new pioneer deh850 and u cant read the clock because the unit is too high. and suggestions on how i could do it?  

p.s. i am a DIY kindof guy

chase, the longer you have that pioneer, the more you'll love it, i used to have one