I would purchase something nice but inexpensive. Even if you are looking for a luxury car, you can find a reliable W211 Mercedes-Benz E-Class (MY2003-2009) for under $10k. The V8s are more reliable and in better condition. You can also find some Lexus models which are even more reliable. I think going for a new car payment when you are worried about existing debt payments is misguided.
25 years old
Wells Fargo Platinum - $1500
Chase Sapphire Preferred - $8500
Discover it® Card - $9600
AMEX EveryDay - $8000
Chase Freedom - $5000
Capital One QuicksilverOne - $1900
Barclaycard Apple Rewards - $600
Chase Slate - $1500
Capital One Platinum - $750
Lease - Audi Financial Services - $47,148 cur. balance, $55,063 orig. balance, buy rate money factor, MSRP $83,365
Auto Loan - orig. $20,617, paid/closed
Installment - FNCU - Secured $1500 paid/closed
Installment - City National New Jersey (Self Lender) - Secured orig. $1000, paid/closed
Installment - Lead Bank (Self Lender) - Secured orig. $545, cur. $370
Equifax - 729
TransUnion - 740
Experian - 752