what would be the most powerful video/graphics card i could put in my dual 2.0 g5. it's pci-x and right now i have a ati radeon 128 mb r350 9800. with the millions of graphics/video cards available what is the most powerful option that is compatible. i'm using this to edit video and eventually hd. i have a 24" AL2416W acer 16:9 hd monitor. and in 2 days 8gb of ram. i will eventually get the max connect internal raid. and maybe a kona card. anyways, i'm confused about the video cards. any info would be great.