I'm looking for some help with the installation of a Nav unit in my 2005 A4 3.0. I've called 2 dealerships and I can't get a definitive answer. I've attached two links from Ebay w/ Nav units I would consider. My question is, will I have trouble installing any of these units, ie. compatibility issues. I'm concerned that there's a harness issue or two. I don't have navigation at the moment, but I do have a factory Bose system. Is Plug and Play possible with any of these? Lastly, should I stick with units that were used here in America verses those from Europe? Thanks a ton!

Genuine Audi A4 S4 RNS-E sat nav navigation DVD map SD 2004-2011 | eBay

This unit is from Europe, so I'd have to purchase a Nav disk. They claim" Installation will be plug and play if your current unit is double din zie" comes with security code, GPS antenna, and retro fit kit

02 08 Audi A4 S4 RNS E Navigation Plus CD Radio Head Unit System 8E0035192E | eBay