eVGa is one of the top. I like Asus i have an Asus 6600 and it is so easy to overlcok it hs great features and they back it up wiht a warranty so if you overlcok it and it melts or something they will give you a new one. Also there is bfg, and xfx but those get less good ratings than eVGA.
I have heard good things about my friends PNY card he has a fx5200. He says he loves it. I have PNY ram lol. If that helps.