Black roof; siding a lighter, more subtle green, like BM bassett hall green or Russell Green?? Check the BM Williamsburg Collection of colors.

Sharing a picture would really help joal.

I'd go with a taupe siding that blends in with the grout in the lower half.

I had a similar issue. My house is half RED brick and half siding, similar to yours. Prior to renovating, I had white wide plank siding. I even had green shutters and a green door at one point.

Because of the dominant color of the brick, I had a really hard time choosing the siding color. Although some say you should have the siding match the grout of the brick, I felt taupe was too modern for my house. I almost kept the white, but in the end we got a charcoal roof with Hardieboard grey siding. I'm very happy with it.

My next project is the front stoop, walk and landscaping.