Burn In

The lamp on my projector has nearly run its race. I am thinking of buying a high-def tv to replace it which I will primarily use for a second monitor and for my Xbox 360. I know plasmas have high burn in potential and since I would be using it for a computer desktop that may stay on for 10 hours without changing this sounds like a bad choice. I hear DLPs have the potential for rainbow effects which leaves me with LCDs. I hear LCDs have similar burn in potential. My father owns an LCD screen for his computer and I have never seen burn in although I have seen stuck pixels that are either green or red almost all the time. My question is this: which TVs can I use as a computer monitor that will never burn in and won't look bad (I am open to any specific model or display technology)? Also as a side question what video card will be able to handle a 1080p digital screen and a 1600x1200 at 75hz without lag and still be able to handle blu ray. I'm not much of a gamer on my PC. I currently have a 9500GT and I am not sure that its up to it. I was considering a GTX 260 or a 285 although I find them really high priced for my ideal budget. I also intend to use the card with badaboom in the future to encode blu ray's which will require higher end power to do in a reasonable time span (much less than 6 hours.)

But one thing nice about LCD screens if I'm not mistaken. But I learned this when I studied for my Apple certification, on LCD's, if it does get burn in, you should be able to run something moving on the screen for the same time that it took the image to burn in, and it will supposedly correct itself. Thankfully I've never had to test that knowledge, but you never know.