Save some cash and get the following HD 5670 512MB. http://www.newegg.com/Product/Product.aspx?Item=N82E16814102871&cm_re=hd_5670-_-14-102-871-_-Product
1GB of VRAM does nothing for the HD 5670, it's too slow to use it.Edit:
Actually, I didn't notice the rebate on the XFX, so both cards are almost the same price. Go with whichever one, but there should be no difference in terms of performance unless you can see the extra 1 frame per second (at best).