A good set of custom aluminum alloy wheels changes the entire stance of your car. They cut down on unsprung weight for sharper handling, but keeping them clean and avoiding curb rash takes daily work. You are looking at about $1,400 for a quality set, and that does not include mounting, balancing, or new rubber.
Prices soften up twice a year if you know when to look. Black Friday brings real drops on remaining inventory, and spring rim sales pop up right as people pull their winter tires off. Shop the hardware first and get your price locked in before you even think about how you are going to pay for it.
That 0% intro APR for 15 months on purchases and balance transfers is a deadline, not free money. If you still carry a balance when those 15 months are up, back-calculated interest or standard rates will hit whatever is left.