Need help installing a video card?

I have an old computer from 2003 or 4. I have a really nice monitor for it, and i'd like to run it through VGA, but the video card in the computer, so what video card should I install into it?|||SORRY YOUR QUESTION DOESNT REALLY MAKE SENSE. VGA IS THE OLDER STYLE STANDARD DEFINITION OUTPUT THAT HAS COME STANDARD WITH COMPUTERS SINCE THE MID 90'S. IT IS 15-PIN AND NORMALLY BLUE IN COLOR

I THINK WHAT YOU MEAN IS THAT SINCE YOUR MONITOR IS REAL NICE YOU WANT A HIGH-DEF CARD WHICH USES A DVI OUTPUT CONNECTION (NORMALLY WHITE IN COLOR). BEING THAT YOUR PC IS SOMEWHAT OLD, IT PROBABLY ONLY HAS PCI SLOTS. SO YOU SHOULD PURCHASE A VIDEO CARD THAT HAS DVI OUTPUT AND IS PCI. (NOT PCIE OR PCIX !!!!!