We've got a big light coloured blank wall in our loungeroom. We only use our TV, a 46" Series 5 Samsung LCD, for watching movies or Netflix via an old PC we've got rigged up. We're considering using the big blank space as a projector space instead of using our TV, because the TV is too small for the room, but due to money constraints I'd only be able to afford a second hand projector. Is this worth doing? If it's worth looking at a second hand projector, what models are should I be looking at for watching movies/Netflix? TIA!