Once again, thanks for everyone's support here... Considering I am a new comer, you all have been very nice.
1) Correct me if I am wrong but, From what I read, the 1417 unit is used to add the video option to the NAV Unit...right?
2) And, after my retrofit, I won't be able to watch video while I am driving without disconnecting (or switching off) speed signal coming to NAV unit. So, would the 1280 unit solve that issue or is it used for something completely different purpose?
3) I read few posts about latest version being "F" and "J" and the like.... What unit (RNS-E), software version are the latest that would work in my Audi A6 2001 sedan? - I read in RNS-E upgrade link (thanks TeddyB) that I would need a 4B0-035-192 R unit. Since I want to retain the AM functionality (EU units have different spacing right??) I am thinking to stick with the "R" type unit. I guess I am just confused as to what the latest and the greatest thing (perhaps bugs worked out) I can install without much loss of functionality...