yes the x800 is in that range. the 6800 and 6800 GT are also in that price range if you want nVidia. a good place to shop may be
http://www.newegg.com/ they always have good prices and the shipping is fast (and sometimes free with small stuff like video cards)and almost all thier products have lots of user reviews so you know if there is something wrong/not good with the product.