The idea of running a PCI-e video card in a PCI slot is appalling.
And the Sam460 and X1000 have PCI-e slots (no adapter needed).
Also, it would make sense to buy a higher end card.
Just in case this makes anyone consider a Radeon HD PCI card, a PCI Radeon HD card is in fact running a PCIe card in a PCI slot. Those cards just have a PCI-to-PCIe bridge chip on-board. I used to think that a mid to high-end Radeon HD card plugged into a PCI-to-PCIe bridge was pointless, but tests performed by others show that they do, in fact, make a noticeable improvement over the low-end Radeon HD PCI cards.
Regardless, I also encourage people to get a machine with an actual PCIe slot, if they can.
Hans