TV/Computer monitor help

[popeye]

I've got my front room set up with my CRT type T.V. about 8 feet across the room. Next to my chair is a table with my P.C. and flat panel monitor. I like it this way so can watch T.V. and computify at the same time. I'm thinking about either replacing the T.V. with a flat panel and hooking my computer to it. Or getting a bigger P.C. monitor and hooking the cable for T.V. to it. Is this feasible in either instance without any additional hardware (like a T.V. card in the P.C.)