If you gold the B license, you get the good Miata that you can't buy with your 17k starting credit limit. So, you can take that, put 10k into it for tires, and win the miata enduro, planting 100k in your bank, totaling 107k. From there, buy the first of your 2 cars, the tuscan. Win the tuscan cup, the PD cup (which is cake in the tuscan on slicks), and you're set with wads of cash and some hardcore cars.