yeah toms hardware "VGA Charts" are great. the latest ones compare all the latest pcie cards, and the one before that featured all the latest AGP cards. any graphics card in the last couple of years should be reviewed there.
Adrian's Rojak Pot had an interesting series of charts on recent GPUs from several companies detailing their manufacturing process, memory bandwidth, performance in Mtexels/second, pipelines, DX support, memory bus width, pixel shader versions and architecture if anyone is curious. I copied them all into an excel document for easy reference, they've tabled quite a lot of cards