Hi all. My first post, but been reading for a while.
I too scoured these posts like a psycho for months prior to purchasing and it has been day 5 with my Costco bought Panny TH-50PM50U. Here are my impressions and thanks for the advice:
HDMI all the way: HD Tivo and upconverting Toshiba DVD player with HDMI go through my JVC RX-D401S receiver which connects to the Panny via HDMI. Speaker is the Polk surroundbar with a Polk PSW10 subwoofer.
The setup looks slick as all hell mounted on the wall in slightly differing shades of silver. Yes, I know piano black is the new silver, but I really wanted a Panny based on the reviews, and I wanted Costco based on the return policy. Strongly considered the Pioneer Elite PRO 1130 HD 50" plasma.
I am controlling the setup via a Logitech Harmony 890 with the equiptment behind cabinet doors (the 890 has RF capability).
The TV was calibrated with the Monster ISF calibration video.
Overall, HD via Directv is stunning. SD is OK. DVD seems to suck...I think the problem lies with the DVD player upconverting, then the receiver upconverting as well.
No motion sickness with sports, no pixelation issues. Black levels are superb. Hopefully I can fix this DVD issue.
Calibration video was easy and accurate. I can give my settings out if needed.
The remote is a $300 piece of trash. Totally crappy logitech software for this unit. DO NOT BUY IT or you will have an expensive paperweight like me.
The sound quality is awesome from my audio setup. Obviously the Panny speakers are off.
Overall, after making myself crazy for months trying to decide what TV to buy, I am finally happy, at peace, and going to sleep at normal hours instead of perusing every forum known to man. The peace of mind with the Costco return policy is actually pretty important, I realized.