Voodoo 3s go for about £20 on ebay, Radeon 7xxx are about £30 and 9xxx £60+. I'm a bit of a skinflint and won't pay extra for cutting edge technology that I can't exploit anyway - the last 'brand new' graphics board I bought for any machine was a CVision 3D64 about 5 years back!
In terms of performance, I can't see there being much difference for 2D work. And most advanced 3D features will be unsupported if running less than DirectX 9 in a Wintel box, let alone in Linux PPC or AOS.
