Are you going to paint the stone? Or are you looking for a gray for the garage doors and the small panel?

No, just painting the garage door and small panel. More wood in the back of the house too. Plus front doors and three sets of french doors in back. Thinking the Tricorn black for doors, light gray color for wood and snowbound or alabaster white for trim/fascia.

Your house is a lovely shape. 🌞

I do hope you don’t paint your garage doors in black though. I think it would dominate the facade against the paler stone and look like a cavernous, gaping mouth. If you would like the garage to be the focus, then black will certainly do it

Were you to pull colours from the stone or mortar then the whole look would have a softer impact. Even a darker grey from the same Hue Family as the stone would offer you, a more subtle finish.