Again, any of those lower end cards. There are rumors on the net about 2.1 cards not working so well in 1.0 slots, more so if you have an "off brand" chipset like from Via, etc. A 220 or 240 from Nvidia should be ok. If this is for gaming avoid the higher end cards as you don't have a dual core to push it. If for general use then a GT220 will be fine.