Hey Man,
I just completed ans E7009 install for my 2006 Limited that came without NAV. I can help you with all aspects of this install if you like.
OEM Audio, Video, Radios, Electronics, and Car Navigation Systems has the E7009 units for 1495.00 the last time I checked.
I have a listing of all the parts you will need, I did a few mods beyond those called for in the Forums but mostly used those to a T. I even have the elusive Blue R16 Connector which was difficult to locate and get.
So, I have installed:
E7009 Navigation Head Unit
Steering Wheel Controls from Sienna
Aux Port from 2007 Tundra fitted into blanks of center console.
Toyota Mic Kit Installed for Bluetooth and Voice.
ipod and Rear camera install coming.
XM or Sirius Install Coming (Undecided on which one)
Lemme know if you want any help.
Flyt