You should be fine. You'll have to check the max resolution of the tv and have you video card set to output no higher then the max of the tv. Does your video card have 2 VGA outputs? Or is the TV going to be your only monitor? You might have to either add or upgrade your video card if you want...
First I would see what your cable signal looks like through your tuner card. Second, I'm not sure who your cable provider is, but TWC as well as other cable companies are changing over to "switched digital" service. I was talking to a local cable installer yesterday, I don't understand the...