Maybe get a graphics card. Not sure what options are available without a Blizzard board that supports BVision though, or if you put it in a tower with PCI bus board.
I think there ARE choices though, I just dont know of them.
But I hear the graphics card can help quite a bit. Havent proven that yet myself as I'm still waiting to get my BlizzardPPC fixed. Got a BVision collecting dust in mean time...
Thanks,
Neofree