I have a PowerMac G5 Dual 2.5 (AGP 8X Pro / PCI-X (not PCI-Express)). I want to upgrade my video card. What is the absolutely best video card available for me? What is the short list of the best cards available? I have searched all over, but I just keep getting more confused. I've searched this forum and found some answers, but I'm still confused... Please enlighten me!