In general, nVidia-based cards have always sucked at 2D (not that their 3D image quality is the best either ...), but what you want to look at is the board's RAMDAC (brand and speed). Alas, other factors such as circuit design and trace quality also play in to the equation of getting good 2D output quality.
I'd say ELSA is probably your best bet. They have the most experience/best track record at producing higher end boards.