I have a venerable Dell Dimension 4600 computer.  It has plenty of memory and disk space.  I would like to install Windows 7 on the machine.  As part of that process, I would like to upgrade the video card that I currently have (ATI Radeon 9800 - 128 DDR).  Please note that this computer is used for general business purposes, and not for gaming.  I just want a card that works well with and takes advantage of the capabilities of Windows 7.

Thanks for any recommendations you can offer.