I agree the onboard video has gotten much better and now can also drive dual monitors. I also wanted to use the new Intel E8400 processor as it runs cool and quiet and the best onboard video is only for AMD CPUs.
Have you put TV tuners in the PCs that you have built? That is my only reason for using PCI slots these days. That and adding SATA ports to my WHS box that didn't have SATA on the mobo.