I'm very interested in this discussion as I am in the midst of hooking up a PC to my 65HM167. Here's the saga to date:
I picked up a used Dell GX260 small form factor (SFF) so I could slip it in the cabinet with the other components. The built-in graphics is just VGA and the set only supports 640x480 via VGA. When I first loaded up the OS (Windows XP) and hooked up the computer, it displayed fine at 640x480, but as soon as I loaded up the actual video driver, I lost visual because the lowest res it will do is 800x600. I had to chuckle, but it's not a big deal because I won't be using VGA anyway.
I ordered an Nvidia Geforce 6200 low-profile graphics card which showed up at the house today and I'll be installing it tonight. This card has DVI out and I will be using a DVI-to-HDMI converter and running this into the set via HDMI 3. That's the plan anyway. I will certainly report back and let everyone know how it goes.
I do have an audio question for anyone who may be able to answer. I have a 3MM-to-RCA cable that I'm planning to run from the computer into the TV, but will this work? Is there some way to associate this audio-in with HDMI 3? I kind of have a feeling this won't work, but look forward to any feedback.
Thanks to everyone for the picture settings- those are a huge help. Still considering a professional calibration.