Well, AZN, you may have jumped too quickly there.
BG, what kind of video card does he have now?
Is it AGP or PCIe?
What does he use it for (general use or is he a gamer)?
As long as it is PCIe and he is a gamer, the recommendations in that thread are suitable.
If he has an AGP card go with a 2600 Pro/XT (or if he's a gamer get an HD3850 if the rest of his system can push it properly).
If it's PCIe and he's not a gamer, just get whatever cheapo PCIe card you can find.