You need to be a little more precise about the circumstances under which you want to 'improve the display'. Do you mean for general use, for games, for CAD/CAM, etc., ??
My M/B is a ASUS P5LD2-VM, the chipset is Intel 82945G, the cpu is dual core and runs at 26.6 GHZ, and I have 4 Gigs of RAM. I want to install a 3D Video Card to improve the display. Presently I'm using the onboard video. I need a suggestion for buying a compatable video card, that will give me the best performance for the price. Any other suggestions are welcomed. I would like to stay under $250.