LG is touting its plasma PX950 as the first THX-certified 3D HDTV, and while we didn't run into it at IFA, the company held a press gathering this week in New York to make up for it. So if this set meets THX's rigorous demands -- 400 bench tests and 1,000 data points spread out over 30 test categories -- how does it look to the average consumer? Well, LG certainly has done a lot to prevent ghosting -- that is, image doubling from sync issues with the glasses -- and we were able to enjoy some pretty extreme horizontal viewing angles. What did bother us, however, was the 600Hz su