Video Card Help Please !!!

Hello, I need somebody's advice on how to get the max performance out of my PIONEER KURO plasma 60" flatscreen. As many of you know hi-def 1080 is not powerful enough for these $5000 monitors so I would like to use a video card instead to give this engine the fuel it needs to run correctly. I don't watch cable or reg television I strictly watch prerecorded sporting events, movies etc. Here's the catch I will be running it from a slim chassis pc only so I need a super power or very powerful card that will fit the narrow body chassis and drive this Corvette like it was made to be driven. Please help. Thank you so very much all! Yours, VeeDandy