Consider upgrading the box. Unless you have a source for used older AGP cards; the prices on new boxes are at an all time low.
A used card might present you with a host of reliability problems, while a new box, even with Microsnot's integrated grahics, would make your computer usage much faster as well as more pleasnt.
Some of the big block stores are moving dual processor equipped boxes out the door for less than $300. You might get even better deals online. Unless you are really into graphics intensive work or are one of the game playing addicts, you will be better served with a new box with the integrated graphiics. Later, as money becomes more available, you could add grahics cards, providing you pick a box with expansion capability in mind; like dual cards.
[b]Dawg[/b] ]:)