Judging TV Performance In Store

[drjuicee]

I have been researching Plasma and LCD TV's for a few months on the internet and in store. Here's my dilemma's: First, how do you really judge the PQ in store when most of the TV's aren't hooked up with hdmi and aren't being fed an HD signal. Perhaps this isn't the case at every store in the world but it seems to be the case in my area. Any suggestions on how to judge pq with your own eye, like what to look for and whatnot. I've also checked many sites for reviews and was wondering if there is a site that is generally considered the best.