A gaming console is a multi-year investment, not a seasonal toy. You want to pick a bundle that covers the hardware and the games you actually play so you aren't buying accessories piece by piece later.
Check the release cycles before you bite. A new model often drops right before the holidays, which makes last year's version a smarter buy. It usually costs less and has a massive library of games ready to go.
That 0% window is a deadline, not a gift. If you still have a balance left when the 18 months are up, you will start paying interest on whatever remains, which makes the console much more expensive than you planned.