If you want more than just a TV, as well as more than just a PC, you can combine them both by grabbing an excellent luxury device handmade in Asheville, the Q42 HD-PCTV from Lumenlab. While the picture below, the only one available on the official site, doesn't show much, there are plenty of technical details available, and they look quite impressive...

The product description is this:"The Q computer is an incredible new computer that is both a high-end desktop and an HD-PCTV. (We invented it!) Intel's state-of-the-art Quad core processor is combined with a 1080p HD LCD enclosed in a beautiful hand crafted aluminum frame."

To make things clear, you get a 2-in-1 device that sports a 42 inch full HD LCD, combined with a powerful computer based on a Intel Core 2 Quad Q9300 processor, 2GB of memory, 1TB of storage space, and NVIDIA graphics (there's only specified an "8800GT upgrade available", so I suppose the Q42 comes with a lower-end video card, maybe an 8600GT). The system has silent cooling accessories made by Noctua, and the all aluminum 3.5-inch frame is handmade.

The price of this beauty is $3,850, and there are upgrades for virtually any component, so if you can afford, you can take the price (and features) as high as it gets!