Can someone please explain the differences between the following Hitachi screens and there recommendations. Hitachi 42PD3000 Hitachi 42PD5000 Hitachi 42PMA500E. Thinking of buying Hitachi model but getting a bit stuck, specs seem to be all the same. I am aware the 3000 comes with tuner and speakers which are not really needed for me, however allows less cables going to screen bu does it affect PQ when dvd not direct to screen etc? Pg..