Sounds like you are trying to justify yourself.
Look, this mindframe is the reason why Americans of all income levels today hold an unprecedented level of personal debt. A vehicle is bad debt, and there is no nicer way to put it. Why would you unnecessarily take on a maximum level of bad debt while a student?
Why do you think manufacturers are so keen to intice you with 3 - 5 year warranties? Its because new cars rarely break down!!! Cars that are 1-3 years old also rarely break down, but they are much cheaper since the initial depreciation has already occured.
Finally, the extra 10 to 15 grand is actually much more than that, because it is lended to you at a interest rate (maybe 8 percent). Then you have a $300 - $400 / month car payment that you have to take additional student loans out to pay (at about 6.8% or more). So now you are taking additional loans, to pay another unnecessary loan payment on a new car, which loses 20% of its value when you drive it off the lot.
Lastly, you are unlikely to just "pay it off" when you get out of school, because you will have a 2500 / month student loan payment, 2000 / month house note, 4000 / business loan payment, plus your credit card payments and other bills.
Good luck buddy!