A dalite high power screen will give you the most brightness. The problem with that screen is the projector needs to be mounted as close to eye level as possible to get the most gain. Also, the viewing cone is narrower. There are lot of good deals on cheap manual screens. If you can try out some black out cloth first you will have an idea of how a white screen with @1.0 gain will look.
The Epson 1080 is a very bright projector in the brightest modes. The brightest modes aren't the most accurate, color wise, but for Mario Kart I'm sure it will work well.