Thanks for the UC Mike, although trouble shooting can be harsh, I appreciate the effort

About the GPU choise-issue, I think it's also a socket matter.
Most modern motherboards are supported with PCI Express and regarding to what nVidia did with it (HSI -> AGP and PCI Express compatible), ATI is better of when looking at the benchmark results. But it's only about a couple of percent that we're talking here. More important is what makes PCI Express better to AGP. Here's a simple diagram to indicate why:
Send - recieve - send - recieve -> AGP
Send and recieve - send and recieve - send and recieve - send and recieve -> PCI Express
Which simply states the fact that PCI Express provides a higher bandwidth.
But I somehow still like nVidia better in comparison to ATI due to the elements Slin mentioned before

Cheers
Frazzle