The dark brown is very appropriate with your color scheme. We would even suggest a piece of trim added over the front door to make it a little more proportional under the siding in the gable. We're voting for the last option! Good luck with your project!

I agree with the 3rd option. The longer windows mimic your windows and are more proportionate to the garage door and the large gable.

I can't tell the difference between 2 & 3 but I like them both -- they complement the house without drawing all the attention to the garage.