Tom Fleming

I have a 2007 Avalon Limited that has version 06.1 Navigation DVD. I know that Toyota no longer supports the system but want to know the latest version that was provided and to see if there is any either aftermarket or used DVD's of a later vintage that might be available. Alternately, has anyone replaced the stock navigation system with an aftermarket system that they are happy with? Getting something that integrates with the vehicle system seems to be a pretty complicated task.