RyanJM, carefully check your plasma TV's manual to find out EXACTLY what kind of HD input signals the thing can handle. It may not be designed to properly handle today's common widescreen computer resolutions, even the ones that match HD signals.
As for the RAID set-up, I really don't see the need for such a set-up on a home computer unless you have your own secure data center or your computer must absolutely be up and running at all times. A RAID won't give you that much extra protection especially against fires, floods and theft. In my case, it's much easier to use a second drive as an external backup device which I keep stored off-site in a safety deposit box at the bank.
This way, it doesn't matter what happens to the computer. The data is always safe... in the safe!
