EVGA, Leadtek, and BFG are very nice graphics card makers.
Also Asus uses very high quality parts, but being a larger business their tech support is not as good as it once was. Additionally some of their names can be very deceptive.
MSI, although a long time ago they did have those issues with cheap capacitors, make very nice video cards as well.
Those are the best... obviously, the other brands are fine (with the exception of PNY, and XFX which i will discuss later).
PNY and XFX, are the two brands you will want to stay away from. While there are many nice brands that aren't as high quality as the aformentioned (Powercolor), XFX and PNY traditionally, have poor quality, and bad tech support.
-Kevin