WTB STOCK NAVIGATION KIT for 2005 AUDI A6 4.2L Quattro
 

I am looking to purchase a NEW or USED (Well Maintined) Stock OEM NAVIGATION Control Unit, wiring, instructions for install and any other neccesary components for my 2005 Audi A6 Quattro 4.2L. I am trying to spare as much expense as possible but not trying to spare quality. Please assist. I have seen the appropriate kit selling on EBAY for 1,429 USD. That is over my head. Please advise my options...

I am also looking to purchase OEM Back Up Camera and installation kit, as well as an I-Pod interface that allows me to use all through MMI Interface. Please advise.