BE$T bang for your buck home improvement for home sale

Well I just got done painting a door infested hallway (6 doors), & 4 out of 6 walls of a bedroom, and 12 square feet of four-year-old wall-crayoning. You come back from sea, and you are not supposed to yell at your spouse, but she sure lets the little one and friends tear up the real e$tate. It shouldn't be impress me how much better it looks after a few coats, but it sure does. I probably should replace the linoleum on the floor. Not sure if I should repaint the front door or replace it. They say a dark color should be the color of the door and what ever color it ends up my front window shutters will match it.