I think a light grey would look very smart - white trim. Be sure to paint the garage door the same color as the house to help it disappear.

Do you think the photo may be dark and gloomy?

Pretty house! I actually like the current siding color and think Oyster Bay would look good, too. The current siding color is nice with your roof color, and OB would also work. The black shutters look good and so would Iron Ore. Kind of win-win for you IMO. :-)

Choice 1 - make it lighter - Svelte Sage and Ancient Marble But you did say your neighbor has Svelte Sage and Connected Gray - do you really want something that close to what the neighbor has - or is this down the street a ways and not next door or across the street? Choice 2 - go more greige than green - I always liked this combination - Colonade Gray has a slight green undertone. Just enough to make it work well in your environment. Choice 3 - go with something a bit more bluer green gray than sage. One of my favorite exterior colors is SW Comfort Gray. Found this pic on the internet from an HOA Here is another photo that is an actual photo of Comfort gray vs a rendering. Personal preference - I would pick Comfort Gray, but everyone likes different colors. You will want to test before having it painted.