I went for the EX Navi because I like all the things previous posters didn't.
I love the 16" Diamond cut alloys and the way they fill the arches. Diamond Cut though do need to be carefully looked after to prevent the dreaded white worm.
Mine is CVT and the steering column paddle shift is brilliant once you're used to them especially when overtaking. Not that the 1.3 will overtake much.
The built in nav while not the best is easy to use but I'm not keen on the lane departure warning and road sign recognition.
One of the very best additions to the EX is the reversing camera which makes negotiating even the trickiest manoeuvre a doddle.
Auto lights take a bit of getting used to, not being able to disable them in darker weather and I've had better rain sensing wipers.
This is my first Jazz and I absolutely love it.