Kraven, now that the new models are out, the ST60 from Panasonic is the best bang for the buck set, as noted by Cnet and a few calibrators. Both the ST30 and ST50 have been popular picks as well, generally the same panel as more epensive models, great blacks, and accuracy after calibration. The ST60 got more of the premium line controls this year, and if I was looking, itd be high on the list.
I've owned 5 Panasonics since 2005, and they had a rough couple of years, but really seem to have hit their stride with the 50 and 60 series. The two best plasmas right now are the VT60 and F8500 from Samsung, but they are pricey.
My dad bought a decent LG last year at my recommendation because of his budget. I calibrated it with a meter, and it turned out to be quite accurate, but the blacks leave something to be desired. While not everything, contrast ratio is important and the MLL is very important if doing any dark room viewing. Out of the Panasonic, Samsung and LG, LG has the worst blacks. One of the things you buy a plasma for is the black level, so unless your budget requires, Id recommend the ST60 personally.