> I suggest you get yourself a Radeon X800, which is perfectly capable of running Doom 3, but reduces to complete unusability with Gnome 3, once you hit 6-7 workspaces on a 1920x1200 monitor.
I use one of those low-end AMD Fusion laptop. One of those were the CPU and GPU are integrated together. Gnome 3 runs as well on that system as any desktop, thank-you-very-much.