A better question is "how much?". Closely followed by "Does it *have* to be an iPod? What else will it work with? And do you need anything else apart from the Nav unit (like the MINI iPod cable, or TV function, or anything else)? And how much of my car has to be taken apart to make this happen? And finally how does it deal with the screen being an odd shape (is it just clipping the corners, for example)?
And we've got some rabbits just like those in the third pic. Our 9-month old loves them!