I have an older secondary system with the ati radeon express 200. It plays TF2 really well. But it has a 7950GT PCIE video card in it. Before I put the card in though, even the lowest setting everything would be like a slideshow. Does your computer have room for a PCIE/AGP card? 9500 GTs are really inexpensive for what you get. Here's a Newegg search for 9500 GT.
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&Description=9500gt&bop=And&Order=PRICE&PageSize=20
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