There is no "best".graphics card for most PCs. Instead, there are good combinations of attributes that can be matched against a set of requirements. The appropriate match is determined by the one who sets the requirements.
But for a PC such as the Gateway mini-desktop series, the most likely "best" is whatever is already in the case. Two major limiting factors are the PSU and the PCI Express slot you'd need to use. The PSU could probably be replaced to add power, but that also starts adding heat inside the case. Putting a higher capacity graphics card inside is where most heat would come from while simultaneously messing up airflow.
Worse, the existing integrated graphics is already appropriate for the system. Given the PC itself, it might be unlikely that you can get good usage out of an added graphics card while avoiding problems.
You can check PCI Express (x16) graphics cards to see what you like, and then see if your PSU can support the card. Replace the PSU if needed. But don't be surprised if overheating shows up. And don't be surprised if there's only minimal improvement for whatever you're thinking a new graphics card will do for you. This isn't a big gaming PC.
Tom
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