hello ive got a sharp aquas that is hooked up threw a motorola dct2000 box that the cable company [mediacom]installed this box is ran threw coax cable and the picture is not all that great now my dvd is ran threw a dmhi cable and the pic is great my ? is could i buy a motorola dct6412 and hook up for better picture being i could hook it up with a dmhi also would rather buy than get box threw them because they want $10.a month to rent it thank for your help