go with a radeon 5770 pro. it's not a beefstick, but it's great for the price and you can expect some better performance down the road than the 4870 when DX11 drivers get better.
alternatively i have an 8800 GTS 320 that's in good shape you can have for a low price

That’s right, you have the young gaming with the old(er), white people gaming with black people, men and women, Asian countries gaming with the EU, North Americans gaming with South Americans. Much like world sporting events like the Wolrd Cup, or the Olympics will bring together different nations in friendly competition, (note the recent Asian Cup; Iraq vs. Saudi Arabia, no violence there) we come together. The differences being, we are not divided by our nationalities and we do it 24-7, and on a personal level.
We are a community without borders and without colours, the spirit and diversity of the gaming community is one that should be looked up to, a spirit and diversity other groups should strive toward.