if you mainly watch dvds then any properly calibarted rptv is going to look good.

if you mainly watch cable/sat, then look for one that has a good line doubler. from what i have read the hitachi which i have, seems to have a very good line doubler. it seems to be as good as most low end progressive dvd players. my satellite picture looks very good now that dish network is not compressing the signal so much. on the hitachi calibration covers all inputs, so it has also helped the satellite picture.

many people complain about the mitsubishi because it has a poor line doubler and cable/sat looks bad on it. so that might be another aspect of your research you have to look at. you can compensate for that if you have directv by buying a directv stb that has it's own line doubler built in. that is one reason so many people rave about the zenith 1080. it cost $700-800 but they all say the improvement in picture for regular satellite is astounding.

all research should begin at www.hometheaterspot.com