LOL. My son once thought similarly as you. Then reality hit him, about cars + post graduation expenses, when withdrawls from the national bank of mom/dad ends. You might want to think more about how much you'll need to get your life started post college, which should include a safety net. I suspect once you crunch those figures, $50K for a new luxury SUV will quickly become an extravagance. Keep in mind you can buy a new Honda CR-V for under $30K, which is just a fraction of the cost of the vehicles you want.
If your parents are paying for your next car and the insurance for it, which is not cheap for someone your age, that's awesome. Go for the max. But, if you're planning to do it all on your own, I believe you're setting your sites a bit too high.
fwiw, my son's first car was used Corolla. Under $10K. Paid cash. About as exciting as a Rogue
, extremely reliable, cheap to maintain/repair/insure and gets 30+ mpg. So I don't quite buy "the tied up at dealer" concern unless you buy a Fiat. Another thing to consider about used cars. If money is a concern, if you buy a $10K used car, you are not going to spend in repairs the $40,000 difference it would take just to buy a new luxury SUV. Food for thought.
Sorry if I sound like a dad. I am one.
Enjoy.