Hi,
About the Mobile-Ease and the nav radio... It just mutes the radio and plays through the speakers. Ford sells a harness for this. You do retain volume control, and there is a phone button that pops up on the screen. However, that button does nothing. Also, the voice commands know the word "phone." However, it just responds with "feature not available at this time." It leads me to believe that at one time they had thought of putting better support in. It's a big shame that the nav system doesn't have bluetooth built in. Wouldn't it be great to see the caller id or dialing directory on the screen?
I've ordered the Parrot color (LS I think?) kit. I'll let you know what I think when I get it. I have a Nokia kit in now. It works great, but it has no display.