Buying this week- idrive question

[lonestarhog]

I'm guessing I can save around $5000-$8000 by buying a 2009 but I want the updated idrive. For those that have used both controllers, is it worth the extra money to buy a 2010? Navigation is a must so please factor that into your answer.

I have done my best to look up whether I could upgrade a 2009 controller to the 2010. I don't believe I can without it costing so serious coin. Is this correct? Would this be a viable option?

Thank you everyone! I greatly appreciate your input.