What video card should I get?

I am going to get a video card for my computer soon. I just cant decide what two I should choose from. It is either a 256MB GeForce 7800GS, or a 512MB GeForce 7600GS. They are both AGP, and I dont want to buy a PCI video card. Any sugjestions?|||Go with the 512MB GeForce 7600GS if you play games. I wouldnt recommend a PCI card either.|||find a monitor you like, and find a video card that works with that monitor.