And...we don't have support for the PCIe variant yet.
Which is why I have a 2.7 GHz AGP model with a Radeon 9800XT (with a dual core 2.3 PCIe model with a Radeon X1900GT in waiting).

Frankly, I don't think supporting the PCIe G5s will gives us access to too many "cool" video cards without support for bios emulation (for PC video cards).
The best Radeon available for the PCIe models is the X1900GT which isn't really much of an upgrade from the 800/850XT we already have support for with the AGP models.

Once support is introduced, the SAM460 could support new video cards without the additional complications.