[TheRob]

Unfortunately 1366x768 is not a standard PC resolution, so most graphics cards won't let you set this. I'd say your current resolution is probably the best fit as it's a standard HDTV resolution (720p).

As you've noticed the Vista desktop will look a bit ugly, but depending on what you're watching, the picture quality in Media Center shouldn't be compromised. HD channels are broadcast at a lower resolution anyway, so all live and recorded TV (and DVD) will be 'adjusted' to whatever resolution you've set. True HD sources like Bluray are a different story. But if you don't have a HD player, then you won't notice the difference of not having one-to-one pixel mapping.

Your motion problems will probably have nothing to do with your media centre. The handling of motion has been the achilles heal of LCDs for a long time. Don't know much about the TCL brand, but you could have a hunt through the menus and see what's there. Quite often LCDs have some setting for 'dynamic' pictures that's supposed to enhance fast moving images. In my experience this usually makes fast moving sequences worse as it tends to give an 'artificial' look to the picture. Anyway, only way to know is to experiment.