With all that money down, I would say it would still be very hard for you to find a financial institution that would be willing to lend you some principle, especially at your age, and your situation (the following are assumptinos) without an established time with a company you work with (normally two years or more plus) and proof that you are already responsibly either paying rent or mortgage (normally looking for stable residency of two years or more as well) you are more prone to disapproval for loan applications. I had a difficult time trying to find the right people to lend me the difference and I was going to make a $10500 downpayment towards a $29,500 NSX. It was still troublesome despite having worked for the Air Force for 2.5years and despite having lived on base for 2.5 years as well (and I should tell you that the members of the military are definitely not in any fear of job security issues). Like others have said, you should be taking in enough income monthly that you can be capable of taking care of the unforeseen, and that doesn't refer to
just your NSX as well, because you are young and plenty of opportunities will be thrown your way, you will not want to miss out on these potentially once in a lifetime opportunities... especially when you can wait maybe 2 to 4 years later to own an NSX anyway. The military takes really good care of me in terms of benefits: healthcare, housing, my education (I am still a full-time student), and other basic amenities (food, water, electricity, etc.) so I feel very comfortable making my monthly $487.35 payment in addition to my $75 insurance payment (by the way that insurance payment is atypically low for NSX owners, but I am insured by USAA which is very friendly to members of the armed forces). Despite all this stability in my life, it was still pretty difficult to obtain my loan.
I would be very cautious in terms of being very liberal as to where you apply for a loan because the more times your credit report gets a hard look i.e. when you authorize a financial institution to pull your credit, it actually hurts your credit (trust me I learned the hard way). I would suggest applying for a credit card with a low spending limit, and making monthly payments responsibly in order to build some really good credit, that way when you get your credit pulled, by a financial institution, they will see a solid score above 700 or so.
If it makes any difference, I joined the Air Force when I was 18 (I'm 20 almost 21 now) and had a plan to own an NSX. That meant putting away money into my savings every month to build towards a sizeable downpayment two years down the line. Fast forward to the present, I am now an owner of a '92 which I purchased 5 months ago (still had a difficult time obtaining approval for a loan as previously mentioned), but it took patience and good amount of financial planning ahead of time (as well as delay of gratification). Seeing how you are about the age when I became determined to become an owner of an NSX you can still do the same.
Time Value of Money (It's a concept in terms of putting away money which grows at a steady percentage, aka your savings account), you have time and a monthly income, so keep saving, and when you trade in your own GLI, maybe you can even pay for the balance in full without even having to take out an auto loan. Some might even say to take the auto loan anyway, maybe with a very small monthly amount to also help build credit, but pros and cons can be argued with that. Anyway, I would be glad to help you out if you have any specific questions because I remember how frustrating it was to not be able to own the car I wanted. Let me know? Good luck buddy
Merry Christmas!!!!
-Daniel