A normal TV does not give good enough pics, especially text, from a PC. A high-end HD TV is a different matter though, and could be used as a PC Monitor.
Depending on budget though, a better bet would be something like a Samsung SyncMaster 225MD LCD DVB/HD TV/Monitor. Just a press of a button on a remote control changes it from DTV to PC, just like that !! I have one and it is Grreat!