If your MOB is by MSI here are some possibles, they aren't powerful cards by any stretch, so as long as you aint gonna be playing crysis 2 on extreme then you should be fine .
-HIS HD 4670 IceQ Native HDMI 1GB (128bit) DDR3 AGP
-Radeon HD 4650 1GB 128-bit DDR2 AGP 8X HDCP Ready Video Card
-SAPPHIRE HD 3650 512MB DDR2 AGP