I'd love the whole driving around the city thing. Have to start out with a cab dropping you off at a lot or something and having a very limited choice of what you can afford. Then later you could get a truck and trailer, etc. 👍 Test drives would have to be in the city as well. What sane car salesman would let you take his $40,000 Z06 for a test drive on a race track?! All of the city stuff and financing would be awesome. Would definitely make more people aware of what they are paying. Loan stuff online would be interesting.
I'd be willing to pay about $75-$100 if GT5 had all of that, MUCH better AI, more races altogether (random races would be a nice touch), and improved physics.