Sorry you're having problems with your DLP. I just bought my 50" SXRD A2000 set, and I was pretty apprehensive about the green blob problem. I think I read on avs that roughly ten percent of the people there who had an SXRD set experienced the green blob. Ten percent is enough to make me pretty reluctant, but I set it up last night, did the calibration, and no green blob to speak of. In fact, the picture is fantastic.
cheers,
supervij