Several readers have written in to confirm that the Optoma GT720 successfully runs a true 120Hz refresh rate for 2D gameplay.
This DLP has black frame insertion if you enable 3D mode, for improved motion clarity during 120Hz 2D operation, like LightBoost.
This projector is 1280×720 DLP, 2500 ANSI lumens, and image sizes up to 150 inch! Giant 120Hz gaming for under $1K.
Link: Manufacturer Page and Amazon.com