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.
Dark rich red (burgundy), green (dark hunter green) or blue (deep slate blue) are usually the best choices...in that order. A dark chocolate brown can work too...depending on the house.