A lot of misinformation re Mitsubishi DLP sets. First, Mitsubishi came out with a DLP set before Samsung came out with their set. It used the quite inferior early generation HD1 chip (I know, because I own that set). Mitsubishi briefly got out of the DLP game before coming back with a new model.
I am no fan of the Samsung sets, but, it is incorrect to say that Mitsubishi uses a more expensive and superior chip (if by chip, you mean the mirror device itself). Current Samsungs use the best available chip (HD2+) and Samsung is expected to be the first manufacturer to use the next generation chips.