Your toolbox will feel a lot lighter after you dump excess gear in favor of the Swiss Tech Utili-Key ($8). This lightweight, key-size, six-in-one tool sports a straight knife blade and a serrated cutting surface, a micro-sized screwdriver, a Phillips screwdriver, an eyeglass screwdriver, and a bottle opener. It has a quick-release design for snapping onto a key ring so it's ready to go when you are.
You've about got that deck done but it still looks the rough tree it came from. Put the sanding touch to it with this Skil 3" x 18" Belt Sander w/ Dust Collection ($85). This belt sander gets busy with its 6 amps of power and can do flush edge sanding for that close in touch. It sports an auto track belt alignment and has a built-in dust canister for keeping clouds of dust to a minimum.