Good day.

There is actually more to this than just nut width. Although yes, wider nut width and string placement allows more clearance.

The neck, it's shape, depth can also play a part in finger placement. So keep that in mind when shopping for guitars. Nothing beats a neck you want to hold in your hand.

But before shopping for a new guitar, maybe try looking at elbow placement. Moving the left elbow out just a little will impact the angle of your fingers on the strings, and from working with others, that has sometimes been all it took to clean up buzzy strings. It doesn't take much.

However, if that doesn't work, go find a guitar that you want to play.