I have a Toshiba 51HX83. I had an old Sony non-progressive DVD player. I just got the Denon DVD-1910 but do not yet see any significant upgrade in PQ with 1080i through DVI or 720p through component yet. Any suggestions on how to improve PQ? I've read the following on some forums: 1. Turn off the black enhancement for better PQ. 2. Use only the 720p because of Toshiba's H83 upscaling (?) (If so, why bother to buy a DVI player??) Help.