I wouldn't buy new, DM. I picked my shitebox up for 12 large, if it lasts four years it owes me nothing. I wouldn't go ambassador either. As a non ambassador working for mytaxi with no priority I paid the guts of €150 freight for a 39 hour week a few weeks ago. Imagine what an ambassador with priority would have paid, particularly the ones that cover the "hospitality" jobs with the €2/job surcharge on commission.
I will go New next time, at 53 and a half years old and after being through about nearly 20 used cars in my lifetime I have never had a New car, so I'm gonna spoil myself next time around !
As fer Ambassador, you don't pay any more freight than anyone else, you just see the job offers a few seconds before the regular scum, my usual commission is about 65Euro, never anything like 150 !