I bought a proper HDTV about a year ago, upgrading from a small HD-ready LCD flatscreen, so I won't be looking for anything new right now, naturally.
However, I did figure out recently how to disable overscan on the HDMI inputs - I didn't even think the TV did that since digital media should not need overscan, but after hooking up one of my PCs to the screen the truth hit me in a horrific fashion!
This required some googling and reading through years-old threads on (for me) obscure audio-video forums...
If you got a recent Samsung like me, press the SOURCE button on your remote and pick a HDMI input, then press the TOOLS button. Older TVs alledgedly use the INFO button instead. Select "Edit name" and scroll down to "PC" or "PC DVI". I'm not sure the difference between the two, but if you pick the DVI version you won't get HDMI audio fed through the TV's optical output port (if your TV has one). I therefore use the plain "PC" setting.
You could also pick the "GAME" option I suppose and perhaps enjoy less input latency, but I rather like the framerate buff you get from the TV's image processing when watching movies on my PS3, so I stuck with the previously mentioned setting.