Dear Sir, as long as u have plenty of ram 128/256 MB, and the graphics card is around 32MB, it doesn't really matter. All of the cards on the market have about the same quality 2D quality which is the most relevant for you. Only the Voodoo 5500 stands out in 2D, and that's not that significant anyway. So, as long as it has around 32MB, even a good 16MB would probably do the trick.
Good Luck with the new system.