I have a great color for the front door that will go with the great brick that you have. It is called Shadow from Benjamin Moore - a dark eggplant. I'd leave the garage white unless you want to update the color of the rest of the house. If you look at Houzz or the internet for mid-century exteriors, you'll notice that they do not try to hide the garage door. It becomes one of the blocks of color and in this case the block of color is white.

But if you want to change the colors, I have two from Benjamine Moore that will enhance the warm color of the brick. Edgewood Rocks 1056 for the broad boards at the corner of the house and any large area between the windows, the fascia, the back door as well as, the garage. For the clapboards in the gable and window sashes (or trim) and the porch area, I'd do Deep Beige 2165-40.

On another note, the roof overhang was not designed for gutters and leaders. You could replace the leader with a chain and remove the existing leaders that spoil the look of the home. At ground level, put a few rounded stones to distrubute the water.