A quick note on the competition: I recently reviewed the ViewSonicPX706HD, a DLP gaming projector. Like the Optoma HD143X, it has an input lag of only 16.4ms, but it is priced at $785.99 versus the Optoma’s low $499.99. The ViewSonic is a brighter projector, measuring at 2,972 in its brightest mode, with around 2,000 lumens for modes with good color. So, if you’ve got a brighter room, you may want to consider the ViewSonic PX706HD over the Optoma HD143X.
The Optoma does have a louder speaker, better black levels and is 3D capable, but the ViewSonic has its own set of features: compatibility with PC, Mac, and smart devices, as well as PC-Free Presenting, which may be more useful to you than, say, having 3D, if you’re looking to also use your projector for business or education applications. Although, the ViewSonic does have 3D, too. If using for strictly home entertainment purposes, you may find that the HD143X serves your needs better than the ViewSonic, or that you just don’t need some of those extra features and would rather save a couple hundred.