Do the stucco in the same gray white as the stone - match those together - you are looking for a LRV 55 - 60 ish off white in the gray green direction, not actually white to get the look outside that the stone gives. Test bm gray owl or moonshine - http://www.benjaminmoore.com/en-us/paint-color/grayowl

I think you want to find the right tone of off-white for the stucco and also use it on the exterior block areas of the side fence. A painted gate in a fresh tone would add a lot to that side elevation - same as the front door ideally.

Since the roof is light, the siding area shouldn't go too dark, but something around 30 -35 LRV (Light reflective value) so we have contrast to the off whites. You want a warmer neutral that is a deeper tone of the same pewter gray green. Test for the siding - bm arctic shadows http://www.benjaminmoore.com/en-us/paint-color/arcticshadows

If I've guessed the undertone of your stone from these photos correctly, then this is the right deeper neutral for gray owl, for instance.

If echoing your white stone requires something closer to collingwood or rodeo, then your deeper shade is going to be something warmer too . . river gorge gray for instance. .. you want a tonal contrast rather than a shade contrast here. Let's use the color on the door and gate instead for a high end look. In other words, adjust your siding tone to work with the off white - going a bit warmer rather than cooler with the grays as you go deeper.

Why? The roof is sort of earthy gray / warm gray instead of silvery / blue gray.

If you are thinking black iron, let's set the railing tones aside until we complete the door choices One reason to stick with white is the white windows, but we may do an accent tone that would be great there.

For selling your house, the most powerful color for the front door with these base schemes are going to be a tone that comes out like butter. Test bm harvest time, or desert tan. This is going to bring the "sweet cottage" element but in a way that men buyers like too - yellow is one of men's favorite buying colors - it feels like sunshine and evokes happy for most people. Perfect for a door when you are selling. Leave the gate natural and the railing white to match the windows if you go for the sunshine.

http://www.benjaminmoore.com/en-us/paint-color/harvesttime