Hello I have had the DCT6412 motorola box for Comcast for a while now. My girlfriends dad just signed up for comcast and i noticed he has a totally different looking box than mine. i looked around on the internet and found that comcast has new boxes coming out. these are the dch series. Can any1 inform me on why this change was made and what are the differences between the dct and the dch series? i heard that a cable card is needed for the dch, why is that? do these new boxes improve existing funcionality or picture quality? Should i upgrade and would it cost the same as my existing dvr box?