Interesting again. Didn't know there was 2 versions. car has got a colour screen as on the left. Are they reliable? Probably cost a fortune to fix if it went wrong. Can you get updates online, if so how much anyone? What needed to add MP3?
As far as I'm aware, Bose came as standard on the V6 GTs. The Nav + system I have in mine is very reliable, I've not had a single glitch or fault yet. To put it in perspective, my previous GT just had the standard Bose CD unit with an iPod lead and every few days it would need to be turned off and on again because it would stop making any sound (still on, still behaving just as you would expect, just no sound) when I started up the car.
I'm sure the cost of a potential repair is relative to anything else on the car: expensive, but relatively unlikely unless you get water in it I suppose. If you were thinking that way, then the V6 defiantly isn't for you anyway since if it goes wrong it's more expensive than the four-pot engines to repair as well...
I don't know that you can download updates online, but my car went in for a service today and they updated the software as a matter of course during the service.
The system has a CD/DVD for the maps though, so if you wanted to update the maps you just have to buy a new disc (around £75 from my previous investigations), eject the old one and put in the new one.
I don't believe that this unit supports MP3s although it's simple to get an iPod lead installed (it plugs in where the CD Changer would usually be) if you so wish. You can't really listen to CDs in the Nav unit anyway because the maps disc uses the slot (which is why the CD changer I should imagine!), so I've never even tried.
Here's a picture of mine:
Yfrog - img1129d