What is the *Cheapest* but also sort of decent, graphics card that can play Dawn of War 2?

-I have been wanting to play DoW2 for some what two years now? yeah... but i have never had the correct graphics card for it, i don't want anything pricey and over the top, i just want something that can play DoW2, at the moment i have a Nvidia GeForce 6150SE nForce 430, now i know this won't work because the minimum is Nvidia GeForce 6600 GT or ATI X1600...