I'm researching what sets are likely to come onto the market in the UK between now and the end of the year. Two main players in the consumer market for DLPs are Samsung and Toshiba. Firstly, looking at Samsung, it looks like their older P63 and P67 models us an HD3 DMR. Their new R67 models use an HD4 DMR, and their R77 models use an HD2+ DMR. Then looking at Toshiba, all their models use an HD2+ DMR. So, anyone know what the differences are between an HD2+ chip and the HD4. What's different about an HD5?