I would go for the OC PC click here, as it has the best graphics card (GPU).
The PB IPWRX9830 click here comes next, but its GPU is still relatively weak for gaming. Don't consider any of the others, unless you were thinking of replacing their GPUs with something a lot better. But in doing so, their power supplies (PSU) would need to be upgraded too.
Btw, Arbico's gaming PC section has better GPUs click here.
What resolution is your LCD TV? The greater this is, the more graphics power you'll need. And possibly something better than the OC PC's HD4850. Please let us know the games you intend playing as well. G