currently i have the Comcast Motorola DCT3412 hd-dvr box , have had it for about 1 year (when i ditched DTV for cable). hooked into my Denon avr-2807 receiver into Pioneer Pro Elite fhd-1 50" plasma (all hdmi). i just had the tv professionally IFR calibrated last week and the calibrator guy told me that to take the most advantage of the calibration , i should get the latest Comcast box, or even better (he says) get Tivo THX which he said would dramatically upgrade my pic quality (especially sports). howevet the Tivo is $600 (for most memory) which i would gladly spend if it will perform like he said it would (but i will ask that question over on the appropriate forum). anyway, i live in the Chicago area and would like to know what is the latest hd-dvr box and if what advantage(s) it would have over what i have now. thanks for any advice ! !