I spent a couple of hours with AVIA calibrating my new pioneer SD-643HD5. Once I was finished the picture was unwatchably (is that a word?) dark and flat looking. I tweaked further with THX Optimode and finally ended with my own settings, which were wildly different from AVIA and THX. I have used AVIA before with my Hitachi 50" RPTV and was very impressed with the results. Do I need to let the new RPTV "burn-in" or "settle" before calibrating? Any other issues I should be aware of? I am also interested in hearing from folks who have had professional calibrations done. It seems like the cost fo a good calibration is close to the cost of attending the ISF seminar. I may opt to attend the seminar rather than paying for a one shot deal. Any thoughts??