I'm in the market of buying a new television, however I'm not sure what will be suitable for my needs. I plan on using the TV for the following: DVD's, Blu-Ray's, PC monitor to play PC' games, and PS3 games. I went to bestbuy, they had some pretty decent HDTV 120hz-240hz. The guy also told me about Plasma TV's. I'm unfamiliar with Plasma's. He directed me to one that was 600hz 50" with a reasonable price. Is 600hz an overkill? Will game perform better? I heard that it was just a marketing scheme.