New Car.!

So, I want a Chevy Impala. My dad wants me to get a Chrysler 300 M. But i think the body on the Chrysler is UGLY.! I mean its my money. They won't let me get the jeep I want. So i should at least get the Chevy Impala. Right.? You would think. All the Impalas I want are under my price range. So why not.? I mean seriously.! Both my sisters got the cars they wanted. So, why couldn't i get the car i want in return.? The one my dad wants me to get is a grand over my price range at least, If not more. I mean, come on. You guys talk about how I'm an adult. So, if I'm an adult, and this is MY Money, shouldn't I be able to choose.? My parents want me to get a cheap car, so they can use a grand of MY  money to get my mom a new car. UHMMMM, NOT HAPPENING.!! And they say I'm being selfish. My moms car runs great.! Its in amazing condition. The only thing wrong with it, is that the transmition slips, slightly. Its not even anything to worry about yet. She still has like another 3 to 5 years before thats an issue. So why are they more worried about getting her a car, when mine you have to manually shift.? Its an automatic. That should NOT happen.! Ever, at all.!