I have a Panny 100 PJ I'm very happy with. But a friend wants me to buy her a PJ solely to be used for presentations, driven by a laptop. Just PowerPoint and similar. I think brightness is my only concern. My well be in an office with windows and not blacked-out by any means. How bright is good?? Would 1500 ANSI be alright? Anyone done this and can help me. Thanks.