If you are planning on doing option 2 you will need 840 RP to purchase the cars. Option 1 is an hard choice because it took a while for me to beat the boss. If you are going to go into the Career Levels you have 3 options of car choices for Career Level 1. Well after the tutorial upgrade your car a little and do some online racing to score some RP and cash.
after your purchase you will be given a tutorial on racing, seriously if you all played before just go with it there's no chance you will lose. When you first purchase the game you will be giving a choice to purchase any car, your money will be around $12800 and you will have 60 RP (Respect Points) So you are better off buying a GTI VI or a Cilo, I know it is not a cool car but it is in your price range.
The new version 1.6.8 has many new features including new cars and league races.Seriously Creative mobile just updated a game and takes away people's precious tuned cars well don't worry, I will help you to recreate your fame. I notice lately that a lot of websites are not updated with the new Nitro Nation Drag Racing Walkthrough.